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 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), ... 5
 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, 15, 15, 8, 42, 42, 8, 15, 15, 14, 45, 10, 28, 36, 28, 10, 45, 14, 12, 42, 30, 35, 24, 24, 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 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Antti Karttunen, Table of n, a(n) for n = 1..15051; the first 173 antidiagonals of the array FORMULA A(i,j) = A006068(i) * A006068(j) A(i,j) = A006068(A268725(i,j)). EXAMPLE The top left [1 .. 15] x [1 .. 15] section of the array: 1, 3, 2, 7, 6, 4, 5, 15, 14, 12, 13, 8, 9, 11, 10 3, 9, 6, 21, 18, 12, 15, 45, 42, 36, 39, 24, 27, 33, 30 2, 6, 4, 14, 12, 8, 10, 30, 28, 24, 26, 16, 18, 22, 20 7, 21, 14, 49, 42, 28, 35, 105, 98, 84, 91, 56, 63, 77, 70 6, 18, 12, 42, 36, 24, 30, 90, 84, 72, 78, 48, 54, 66, 60 4, 12, 8, 28, 24, 16, 20, 60, 56, 48, 52, 32, 36, 44, 40 5, 15, 10, 35, 30, 20, 25, 75, 70, 60, 65, 40, 45, 55, 50 15, 45, 30, 105, 90, 60, 75, 225, 210, 180, 195, 120, 135, 165, 150 14, 42, 28, 98, 84, 56, 70, 210, 196, 168, 182, 112, 126, 154, 140 12, 36, 24, 84, 72, 48, 60, 180, 168, 144, 156, 96, 108, 132, 120 13, 39, 26, 91, 78, 52, 65, 195, 182, 156, 169, 104, 117, 143, 130 8, 24, 16, 56, 48, 32, 40, 120, 112, 96, 104, 64, 72, 88, 80 9, 27, 18, 63, 54, 36, 45, 135, 126, 108, 117, 72, 81, 99, 90 11, 33, 22, 77, 66, 44, 55, 165, 154, 132, 143, 88, 99, 121, 110 10, 30, 20, 70, 60, 40, 50, 150, 140, 120, 130, 80, 90, 110, 100 PROG (Scheme) (define (A268724 n) (A268724bi (A002260 n) (A004736 n))) (define (A268724bi row col) (* (A006068 row) (A006068 col))) CROSSREFS Cf. A268725. Cf. A006068 (row 1, column 1). Cf. A268716 (row 3, column 3). Cf. A268721 (the antidiagonal sums). Cf. also A268714. Sequence in context: A200770 A265965 A192787 * A248569 A214101 A286952 Adjacent sequences: A268721 A268722 A268723 * A268725 A268726 A268727 KEYWORD nonn,tabl AUTHOR Antti Karttunen, Feb 13 2016 STATUS approved

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Last modified May 29 00:29 EDT 2024. Contains 372921 sequences. (Running on oeis4.)