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Index to OEIS: Section Se

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sec(x), Taylor series for: A046976*/A046977*, A000364*/A000142*
sec(x): see also A000111
secant numbers: A000364*
secant-tangent numbers: A000111*
Second moment:: A006733, A006741, A006737
Secret Santa: A102262/A102263
segmented numbers: A002048*
self numbers, sequences related to :

self numbers:: A003052*, A003219, A006378

Self-contained numbers:: A005184
self-describing numbers, sequences related to :

self-describing numbers: A104784, A108810, A059504, A109775, A109776

self-dual, sequences related to :

self-dual:: A005137, A003179, A007147, A003178, A001532, A002080, A001206, A006688, A002841, A004104, A001531, A003184, A002077, A004107

self-generating sequences, sequences related to :

self-generating sequences:: A005041, A007538, A003160, A003045, A003044, A005243, A001149, A005244, A005242, A001856, A003145, A003144, A003157, A003156, A003146

self-inverse sequences: see also permutations of the integers, self-inverse
semi-Fibonacci numbers: A030067*
semigroups , sequences related to :

semigroups : A001423*, A023814*, A027851*, A079175

semigroups, asymmetric: A058104*, A058105, A058106, A058107*, A058113-A058115, A058168-A058170

semigroups, by idempotents: A002786, A002787, A002788, A005591, A006966, A058108*, A058109-A058122, A058123*, A058166*, A058167-A058170

semigroups, commutative: A001426*, A006966, A023815*, A058105, A058116, A058117, A058167, A058168, A079201

semigroups, idempotent: A002788*, A006966, A030449, A030450, A058112*, A058115, A058122

semigroups, inverse: A001428*

semigroups, non-commutative: A079198, A079199, A079180

semigroups, numerical: A007323

semigroups, regular: A001427

semigroups, relation: A007903

semigroups, self-converse: A029851*, A058106, A058118-A058122, A058169

semigroups, with identity: see monoids

semigroups: see also monoids

semigroups: see also A030450, A079207, A079208, A079209, A079241, A079242, A079243, A079244, A079245

semiorders: A006531
semiperfect numbers: A005835*
semiprimes (or semi-primes): sequences related to :

semiprimes (or semi-primes): A001358*, A072000 ("pi"), A064911, A066265

semiprimes: see also almost primes

separating families: A007600
sequence and first differences include all numbers, etc.: sequences related to :

sequence and first differences include all numbers, etc.: (1) A005228*, A030124, A037257, A037258, A037259, A061577, A140778, A129198, A129199

sequence and first differences include all numbers, etc.: (2) A100707, A093903, A005132, A006509, A081145, A099004, A225376, A225377, A225378, A225385, A225386, A225387

sequence and first differences include all numbers, etc.: see also Hofstadter sequences

sequences by number of increases: A000575
sequences depending on A-numbers in OEIS: see diagonal sequences
Sequences of prescribed quadratic character:: A001990, A001992, A001988, A001986
sequences offering a monetary reward, sequences related to :

sequences offering a monetary reward: A030979, A057641, A079526, A058209

sequences that contain every finite sequence of nonnegative integers, sequences related to :

sequences that contain every finite sequence of nonnegative integers: A067255 A108730 A108731 A098280 A098281 A098282 A108244 A108736 A108737 A055932 A066099

sequences that need extending,  :

sequences that need extending, challenge problems: Looking for a good challenge? Try any of the following:

sequences that need extending, challenge problems: A000937 (closed n-snake-in-the-box problem)

sequences that need extending, challenge problems: A003142 (no-3-in-line on 3^n grid)

sequences that need extending, challenge problems: A004137 (maximal number of edges in a graceful graph on n nodes)

sequences that need extending, challenge problems: A006945 (smallest odd number that requires n Miller-Rabin primality tests)

sequences that need extending, challenge problems: A016088 and A046024 (when does Sum 1/p (p prime) exceed n?)

sequences that need extending, challenge problems: A076523 (maximal number of halving lines for 2n points in plane)

sequences that need extending, challenge problems: A081287 (packing squares of sizes 1 to n)

sequences that need extending, challenge problems: A085000 (maximal determinant of an n X n matrix using the integers 1 to n^2)

sequences that need extending, challenge problems: A087725 (n X n generalization of Sam Loyd's Fifteen Puzzle)

sequences that need extending, challenge problems: A087983 (values taken by permanent of n X n (0,1)-matrix)

sequences that need extending, challenge problems: A089472 (values taken by the determinant of a real (0,1)-matrix of order n)

sequences that need extending, challenge problems: A099155 (snake-in-the-box problem)

sequences that need extending, challenge problems: {a(1) = 1, a(2) = 4, a(3) <= 8, a(4) <= 24, a(5) <= 32}, from Erich Friedman, not yet in OEIS: minimum value of k so that k copies each of cubes of sides 1 through n can be used to exactly fill some rectangular box

sequences that need extending, short sequences that badly need extending: (1) A001220 (Wieferich primes), A003142 (non-collinear points in cube), A007540 (Wilson primes), A048872 (line arrangements), A054909 (even unimodular lattice), A055549 (normal matrices), A058759 and A056287 (Shannon switching function), A074025 (triplewhist tournaments)

sequences that need extending, short sequences that badly need extending: (2) A076337 (Riesel numbers)

sequences that need extending: see also Challenge Problems: Independent Sets in Graphs

sequences that need extending: see also conjectured sequences

sequences that need extending: see also unsolved problems in number theory (selected)

sequences that need extending: see also huge web page with full list of sequences that need extending

sequences which agree for a long time but are different, sequences related to :

sequences which agree for a long time but are different: A004953, A004973, A025646, A025661, A025647, A025653, A084500, A084557, A103127, A103192, A103747, A010918, A019484, A078608, A129935

sequences which grow too rapidly to have their own entries, sequences related to :

sequences which grow too rapidly to have their own entries, see: Ackermann numbers (Comments on A046859), Conway-Guy sequence (Comments on A046859), Friedman sequence (Comments on A014221), Goodstein sequence (Comments on A056041), n!!...! (Comments on A000142 and A000197)

sequences whose extension requires factoring large numbers: A031439, A031440, A031442, A082021, A082132, A034970, A084599
sequences with a gap , sequences related to :

sequences with a gap (some later term is known) (1): A000043, A001438, A002853, A005136, A006066, A016729, A027623, A037289, A048893,

sequences with a gap (some later term is known) (2): A051070, A063984, A064156, A068314, A068489, A070911, A072127, A072128,

sequences with a gap (some later term is known) (3): A072288, A074025, A077659, A078457, A078714, A078814, A080371, A080372,

sequences with a gap (some later term is known) (4): A080802, A088622, A091295, A091967, A094670, A098472, A098876, A100804,

sequences with a gap (some later term is known) (5): A103833, A105674, A105676, A105677, A109886, A110409, A112822, A113571,

sequences with a gap (some later term is known) (6): A114457, A118710, A119479, A119734, A121154

sequences with a gap (some later term is known) (7): A002982, A005849, A055233, A064593, A066289

sequences with a gap (some later term is known) (8): (circulant graphs) A049287, A049288, A049289, A049297, A049309, A060966, A082276

sequences with a large but finite number of terms: see finite sequences with a large number of terms
Serbian: A056597
Serbian: see also Index entries for sequences related to number of letters in n
series-parallel , sequences related to "series-parallel" :

series-parallel networks, approximation to: A058585

series-parallel networks: A000084* A000669* A001572 A001573 A001574 A001575 A001677 A006349 A006350 A006351

series-parallel networks: see also Moon (1987), "Some enumerative results on series-parallel networks", sequences mentioned in

series-parallel numbers: A000137 A000163 A000432 A000527 A005840 A007803 A036654 A036655 A048172 A051045 A051389 A053554

set partitions

set partitions: A000110, A193023

set partitions: see also Bell numbers

set partitions: see also Stirling numbers of 2nd kind

set partitions: see also under partitions

sets of lists: A000262, A002868
sets: see also under partitions
sexy prime pairs: A023201, A046117
shadow of constants: A108912, A110557, A110621, A110623
Shannon switching function: A058759*
Shell sort: A003462, A033622, A036562, A036564, A036569, A055875, A055876
Shell sort: see also sorting
shift registers , sequences related to :

shift registers, enumeration of output sequences: A000013, A000016, A000031

shift registers, enumeration of: A001139

shift registers, periods: A005417

shift registers, see also necklaces

shifts left when transformed, sequences related to :

shifts left when transformed:: (1) A007461, A007439, A007560, A007464, A003238, A007562, A007477, A007558, A007462, A007463, A007548, A007469

shifts left when transformed:: (2) A003659, A007460, A007551, A007557, A007561, A007563, A007472, A007549, A007470, A007564, A007556

shoe lacing: see lacing a shoe
shoelaces: see lacing a shoe
shogi (Japanese chess): A062103
short sequences that need extending, see sequences that need extending
shuffle , shuffling etc., sequences related to :

shuffle groups: see groups, shuffle

shuffling (1): A000375 A000376 A002139 A007070 A007071 A007346 A014525 A014766 A014767 A019567

shuffling (2): A024222 A024542 A035485 A035490 A035491 A035492 A035493 A035494 A035499 A035500 A035501 A047992

shuffling (3): A002326* A055388 A051732* A051733 A217948

• This is a section of the Index to the OEIS®.
• For further information see the main Index to OEIS page.
• Please read Index: Instructions For Updating Index to OEIS before making changes to this page.
• If you did not find what you were looking for in this Index, you can always search the database for a particular word or phrase.
• Full list of sections: