A276945 Square array A(row,col): A(row,1) = A276155(row), and for col > 1, A(row,col) = A276154(A(row,col-1)); Dispersion of primorial base left shift A276154.

1, 2, 3, 6, 8, 4, 30, 36, 12, 5, 210, 240, 60, 14, 7, 2310, 2520, 420, 66, 32, 9, 30030, 32340, 4620, 450, 216, 38, 10, 510510, 540540, 60060, 4830, 2340, 246, 42, 11, 9699690, 10210200, 1021020, 62370, 30240, 2550, 270, 44, 13, 223092870, 232792560, 19399380, 1051050, 512820, 32550, 2730, 276, 62, 15

Offset

1,2

Comments

The array A(row,col) is read by descending antidiagonals: A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), etc.

Entries in column k are all multiples of A002110(k-1). Dividing that factor out gives array A286625. - Antti Karttunen, Jun 30 2017

Links

Antti Karttunen, Table of n, a(n) for n = 1..630; the first 35 antidiagonals of array

Index entries for sequences that are permutations of the natural numbers

Index entries for sequences related to primorial base

Formula

A(row,1) = A276155(row); for row > 1, A(row,col) = A276154(A(row,col-1)).

Example

The top left corner of the array:
   1,  2,   6,   30,   210,    2310,    30030,    510510
   3,  8,  36,  240,  2520,   32340,   540540,  10210200
   4, 12,  60,  420,  4620,   60060,  1021020,  19399380
   5, 14,  66,  450,  4830,   62370,  1051050,  19909890
   7, 32, 216, 2340, 30240,  512820,  9729720, 223603380
   9, 38, 246, 2550, 32550,  542850, 10240230, 233303070
  10, 42, 270, 2730, 34650,  570570, 10720710, 242492250
  11, 44, 276, 2760, 34860,  572880, 10750740, 243002760
  13, 62, 426, 4650, 60270, 1023330, 19429410, 446696250
  15, 68, 456, 4860, 62580, 1053360, 19939920, 456395940
  16, 72, 480, 5040, 64680, 1081080, 20420400, 465585120
  17, 74, 486, 5070, 64890, 1083390, 20450430, 466095630
  18, 90, 630, 6930, 90090, 1531530, 29099070, 669278610

Prog

(Scheme)
(define (A276945 n) (A276945bi (A002260 n) (A004736 n)))
(define (A276945bi row col) (if (= 1 col) (A276155 row) (A276154 (A276945bi row (- col 1)))))

Crossrefs

Inverse permutation: A276946.

Transpose: A276943. One more than A286615.

Column 1: A276155.

Row 1: A002110.

Row 2: A276939.

Row 3: A088860 (2*A002110).

Row 11: 2*A276939 (row 2) from 16, 72, 480, 5040, 64680, ... onward.

Row 13: 3*A002110, from 18, 90, 630, 6930, 90090, ... onward.

Cf. A276154.

Cf. also arrays A286625, A276955.

Sequence in context: A191453 A191454 A276955 * A246266 A284385 A282940

Adjacent sequences: A276942 A276943 A276944 * A276946 A276947 A276948

Keyword

nonn,base,tabl

Author

Antti Karttunen, Sep 24 2016

Status

approved