cp's OEIS Frontend

A268724 Square array A(i,j) = A006068(i) * A006068(j), read by antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...

%I A268724 #11 Feb 14 2016 14:57:35
%S A268724 1,3,3,2,9,2,7,6,6,7,6,21,4,21,6,4,18,14,14,18,4,5,12,12,49,12,12,5,
%T A268724 15,15,8,42,42,8,15,15,14,45,10,28,36,28,10,45,14,12,42,30,35,24,24,
%U A268724 35,30,42,12,13,36,28,105,30,16,30,105,28,36,13,8,39,24,98,90,20,20,90,98,24,39,8,9,24,26,84,84,60,25,60,84,84,26,24,9
%N A268724 Square array A(i,j) = A006068(i) * A006068(j), read by antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...
%H A268724 Antti Karttunen, <a href="/A268724/b268724.txt">Table of n, a(n) for n = 1..15051; the first 173 antidiagonals of the array</a>
%F A268724 A(i,j) = A006068(i) * A006068(j)
%F A268724 A(i,j) = A006068(A268725(i,j)).
%e A268724 The top left [1 .. 15] x [1 .. 15] section of the array:
%e A268724    1,  3,  2,  7,   6,  4,  5,  15,  14,  12,  13,   8,   9,  11,  10
%e A268724    3,  9,  6,  21, 18, 12, 15,  45,  42,  36,  39,  24,  27,  33,  30
%e A268724    2,  6,  4,  14, 12,  8, 10,  30,  28,  24,  26,  16,  18,  22,  20
%e A268724    7, 21, 14,  49, 42, 28, 35, 105,  98,  84,  91,  56,  63,  77,  70
%e A268724    6, 18, 12,  42, 36, 24, 30,  90,  84,  72,  78,  48,  54,  66,  60
%e A268724    4, 12,  8,  28, 24, 16, 20,  60,  56,  48,  52,  32,  36,  44,  40
%e A268724    5, 15, 10,  35, 30, 20, 25,  75,  70,  60,  65,  40,  45,  55,  50
%e A268724   15, 45, 30, 105, 90, 60, 75, 225, 210, 180, 195, 120, 135, 165, 150
%e A268724   14, 42, 28,  98, 84, 56, 70, 210, 196, 168, 182, 112, 126, 154, 140
%e A268724   12, 36, 24,  84, 72, 48, 60, 180, 168, 144, 156,  96, 108, 132, 120
%e A268724   13, 39, 26,  91, 78, 52, 65, 195, 182, 156, 169, 104, 117, 143, 130
%e A268724    8, 24, 16,  56, 48, 32, 40, 120, 112,  96, 104,  64,  72,  88,  80
%e A268724    9, 27, 18,  63, 54, 36, 45, 135, 126, 108, 117,  72,  81,  99,  90
%e A268724   11, 33, 22,  77, 66, 44, 55, 165, 154, 132, 143,  88,  99, 121, 110
%e A268724   10, 30, 20,  70, 60, 40, 50, 150, 140, 120, 130,  80,  90, 110, 100
%o A268724 (Scheme)
%o A268724 (define (A268724 n) (A268724bi (A002260 n) (A004736 n)))
%o A268724 (define (A268724bi row col) (* (A006068 row) (A006068 col)))
%Y A268724 Cf. A268725.
%Y A268724 Cf. A006068 (row 1, column 1).
%Y A268724 Cf. A268716 (row 3, column 3).
%Y A268724 Cf. A268721 (the antidiagonal sums).
%Y A268724 Cf. also A268714.
%K A268724 nonn,tabl
%O A268724 1,2
%A A268724 _Antti Karttunen_, Feb 13 2016