A205142 - OEIS

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A205142

s(k)-s(j), where (s(k),s(j)) is the least such pair for which n divides their difference, and s(j)=j(3j-1)/2, the j-th pentagonal number.

3

4, 4, 21, 4, 10, 30, 7, 16, 144, 10, 11, 48, 13, 70, 30, 16, 17, 144, 19, 80, 21, 22, 23, 48, 50, 130, 1161, 112, 29, 30, 31, 64, 66, 34, 35, 144, 37, 190, 39, 80, 41, 84, 43, 308, 225, 46, 47, 48, 196, 50, 102, 260, 53, 1242, 110, 112, 57, 58, 59, 120

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

OFFSET

1,1

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: A216164 A270376 A323744 * A072696 A075219 A264650

Adjacent sequences: A205139 A205140 A205141 * A205143 A205144 A205145

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 25 2012

STATUS

approved