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 A245570 Rectangular array A read by (upward) antidiagonals: A(n,k) = n/gcd(n,10^k), n,k >= 1. 0
 1, 1, 1, 3, 1, 1, 2, 3, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 7, 3, 1, 1, 3, 1, 1, 4, 7, 3, 1, 1, 3, 1, 1, 9, 2, 7, 3, 1, 1, 3, 1, 1, 1, 9, 1, 7, 3, 1, 1, 3, 1, 1, 11, 1, 9, 1, 7, 3, 1, 1, 3, 1, 1, 6, 11, 1, 9, 1, 7, 3, 1, 1, 3, 1, 1, 13, 3, 11, 1, 9, 1, 7, 3, 1, 1, 3, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Columns of A converge to A132740. LINKS Table of n, a(n) for n=1..91. EXAMPLE Array A begins: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ... 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ... 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, ... 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, ... 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ... 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, ... 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, ... 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, ... 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, ... ... MATHEMATICA Grid[Table[n/GCD[n, 10^k], {n, 12}, {k, 12}]] (* Array *) Flatten[Table[(n - k + 1)/GCD[n - k + 1, 10^k], {n, 13}, {k, n}]] (* Array antidiagonals flattened *) CROSSREFS Cf. A132740. Sequence in context: A064048 A336218 A016464 * A243925 A348282 A030727 Adjacent sequences: A245567 A245568 A245569 * A245571 A245572 A245573 KEYWORD nonn,tabl AUTHOR L. Edson Jeffery, Jul 25 2014 STATUS approved

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Last modified February 21 06:16 EST 2024. Contains 370219 sequences. (Running on oeis4.)