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A087129 First differences of A087128. 2
1, 3, 1, 7, 9, 3, 9, 3, 9, 12, 3, 12, 24, 9, 36, 3, 33, 3, 12, 9, 3, 12, 9, 12, 15, 24, 9, 12, 15, 33, 12, 24, 3, 9, 36, 3, 9, 24, 36, 27, 12, 12, 9, 3, 21, 96, 3, 9, 3, 12, 9, 3, 12, 105, 3, 60, 12, 9, 39, 45, 27, 9, 12, 3, 12, 12, 45, 12, 15, 33, 15, 21, 3, 9, 3, 12, 9, 24, 3, 33, 15, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It appears that, for n>4, a(n)=3k, for some integer k where k is not equal to 2 (mod 4). This has been verified for more than 3500 terms.

LINKS

Table of n, a(n) for n=1..82.

CROSSREFS

Cf. A087128.

Sequence in context: A229837 A019639 A011207 * A286436 A011308 A033465

Adjacent sequences:  A087126 A087127 A087128 * A087130 A087131 A087132

KEYWORD

nonn

AUTHOR

John W. Layman, Aug 16 2003

STATUS

approved

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Last modified October 19 15:49 EDT 2018. Contains 316365 sequences. (Running on oeis4.)