login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A274079 Table read by rows: the n-th row is the list of numbers diagonally up and to the right of n in the natural numbers read by antidiagonals. 5
2, 4, 5, 4, 7, 8, 7, 9, 8, 7, 11, 12, 11, 13, 12, 11, 14, 13, 12, 11, 16, 17, 16, 18, 17, 16, 19, 18, 17, 16, 20, 19, 18, 17, 16, 22, 23, 22, 24, 23, 22, 25, 24, 23, 22, 26, 25, 24, 23, 22, 27, 26, 25, 24, 23, 22, 29, 30, 29, 31, 30, 29, 32, 31, 30, 29, 33, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Peter Kagey, Table of n, a(n) for n = 1..10000

EXAMPLE

A000027 read by antidiagonals is:

1 2 4 7

3 5 8

6 9

...

Thus:

Row 1: []

Row 2: []

Row 3: [2]

Row 4: []

Row 5: [4]

Row 6: [5, 4]

Row 7: []

Row 8: [7]

Row 9: [8, 7]

MATHEMATICA

Table[Reverse@ Range[SelectFirst[Reverse@ #, # < n &] + 1, n - 1] - 1, {n, 2, 35}] &[Accumulate@ Range[0, 15] + 1] // Flatten (* Michael De Vlieger, Jun 10 2016, Version 10 *)

PROG

(Haskell)

a274079 n = a274079_list !! (n - 1)

a274079_list = concatMap a274079_row [1..]

a274079_tabf = map a274079_row [1..]

a274079_row n = [n-1, n-2..n - a002262 (n - 1)]

CROSSREFS

Cf. A000027, A269526, A273823, A273824, A273825, A274080.

Sequence in context: A070784 A200289 A165044 * A296372 A278300 A034214

Adjacent sequences:  A274076 A274077 A274078 * A274080 A274081 A274082

KEYWORD

nonn,tabf

AUTHOR

Peter Kagey, Jun 09 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 22 16:06 EDT 2021. Contains 343177 sequences. (Running on oeis4.)