A205139 - OEIS

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A205139

The index j<k such that n divides s(k)-s(j), where k is the least index (A205138) for which such j exists, and s(k)=k*(3k-1)/2, the k-th pentagonal number.

1, 1, 1, 1, 3, 2, 2, 5, 1, 3, 1, 4, 4, 4, 2, 5, 2, 1, 6, 3, 1, 7, 3, 4, 1, 9, 1, 2, 4, 2, 10, 21, 6, 1, 5, 1, 12, 14, 3, 3, 6, 8, 14, 4, 4, 2, 7, 4, 6, 1, 10, 7, 8, 2, 5, 2, 5, 3, 9, 12

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OFFSET

1,5

COMMENTS

For a guide to related sequences, see A204892.

LINKS

Table of n, a(n) for n=1..60.

MATHEMATICA

(See the program at A205138.)

CROSSREFS

Cf. A205138, A204892.

Sequence in context: A192183 A133518 A120729 * A092743 A139420 A092895

Adjacent sequences: A205136 A205137 A205138 * A205140 A205141 A205142

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 25 2012

STATUS

approved