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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
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
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.)