A205131 - OEIS

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A205131

The index j<k such that n divides s(k)-s(j), where k is the least index (A205130) for which such j exists, and s(k)=2*k^2-k, the k-th hexagonal number.

1, 1, 2, 1, 1, 3, 1, 1, 2, 3, 2, 2, 3, 1, 3, 1, 4, 1, 4, 2, 5, 2, 5, 3, 6, 9, 1, 7, 7, 3, 7, 1, 8, 12, 3, 5, 9, 4, 2, 5, 10, 6, 10, 1, 1, 5, 11, 2, 2, 4, 3, 8, 13, 6, 6, 5, 2, 21, 14, 2

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

For a guide to related sequences, see A204892.

LINKS

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

MATHEMATICA

(See the program at A205130.)

CROSSREFS

Cf. A205130, A204892.

Sequence in context: A007862 A285851 A055169 * A175892 A010783 A306680

Adjacent sequences: A205128 A205129 A205130 * A205132 A205133 A205134

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 25 2012

STATUS

approved