A087129 First differences of A087128.

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

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: A306566 A329943 A011207 * A286436 A011308 A347840

Adjacent sequences: A087126 A087127 A087128 * A087130 A087131 A087132

Keyword

nonn

Author

John W. Layman, Aug 16 2003

Status

approved