cp's OEIS Frontend

A286625 Square array A(n,k) = A276945(n,k)/A002110(k-1), read by descending antidiagonals A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), etc.

%I A286625 #15 Oct 27 2019 22:00:30
%S A286625 1,1,3,1,4,4,1,6,6,5,1,8,10,7,7,1,12,14,11,16,9,1,14,22,15,36,19,10,1,
%T A286625 18,26,23,78,41,21,11,1,20,34,27,144,85,45,22,13,1,24,38,35,222,155,
%U A286625 91,46,31,15,1,30,46,39,324,235,165,92,71,34,16,1,32,58,47,438,341,247,166,155,76,36,17,1,38,62,59,668,457,357,248,287,162,80,37,18
%N A286625 Square array A(n,k) = A276945(n,k)/A002110(k-1), read by descending antidiagonals A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), etc.
%H A286625 Antti Karttunen, <a href="/A286625/b286625.txt">Table of n, a(n) for n = 1..1275; the first 50 antidiagonals of array</a>
%H A286625 <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>
%F A286625 A(n,k) = A276945(n, k) / A002110(k-1).
%e A286625 The top left 12 X 12 corner of the array:
%e A286625    1,  1,  1,   1,   1,   1,   1,   1,    1,    1,    1,    1
%e A286625    3,  4,  6,   8,  12,  14,  18,  20,   24,   30,   32,   38
%e A286625    4,  6, 10,  14,  22,  26,  34,  38,   46,   58,   62,   74
%e A286625    5,  7, 11,  15,  23,  27,  35,  39,   47,   59,   63,   75
%e A286625    7, 16, 36,  78, 144, 222, 324, 438,  668,  900, 1148, 1518
%e A286625    9, 19, 41,  85, 155, 235, 341, 457,  691,  929, 1179, 1555
%e A286625   10, 21, 45,  91, 165, 247, 357, 475,  713,  957, 1209, 1591
%e A286625   11, 22, 46,  92, 166, 248, 358, 476,  714,  958, 1210, 1592
%e A286625   13, 31, 71, 155, 287, 443, 647, 875, 1335, 1799, 2295, 3035
%e A286625   15, 34, 76, 162, 298, 456, 664, 894, 1358, 1828, 2326, 3072
%e A286625   16, 36, 80, 168, 308, 468, 680, 912, 1380, 1856, 2356, 3108
%e A286625   17, 37, 81, 169, 309, 469, 681, 913, 1381, 1857, 2357, 3109
%o A286625 (Scheme)
%o A286625 (define (A286625 n) (A286625bi (A002260 n) (A004736 n)))
%o A286625 (define (A286625bi row col) (/ (A276945bi row col) (A002110 (- col 1))))
%Y A286625 Transpose: A286623.
%Y A286625 Cf. A002110, A276945.
%Y A286625 Column 1: A276155.
%Y A286625 Row 1: A000012, Row 2: A008864, Row 3: A100484, Row 4: A072055, Row 5: A023523 (from its second term onward), Row 6: A286624.
%Y A286625 Cf. A276617 (analogous array).
%K A286625 nonn,tabl
%O A286625 1,3
%A A286625 _Antti Karttunen_, Jun 28 2017