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A155750 First differences of A031215. 1
4, 6, 6, 10, 8, 6, 10, 8, 10, 8, 10, 12, 6, 6, 18, 8, 12, 12, 10, 8, 12, 6, 24, 6, 10, 12, 12, 8, 10, 12, 18, 6, 20, 12, 10, 14, 10, 14, 12, 12, 12, 10, 14, 6, 16, 12, 12, 18, 20, 16, 12, 8, 16, 8, 12, 6, 22, 6, 12, 14, 10, 18, 18, 14, 10, 14, 12, 18, 22, 12, 6, 12, 18, 6, 18, 6, 24 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are even. Do all even numbers (A005843) appear at least once?

LINKS

Table of n, a(n) for n=1..77.

FORMULA

a(n)= A001223(2n)+A001223(2n+1). - R. J. Mathar, Feb 27 2009

a(n)= A031131(2n). - R. J. Mathar, Feb 27 2009

CROSSREFS

Cf. A110854, A155067.

Sequence in context: A183986 A160995 A215454 * A159475 A098350 A276269

Adjacent sequences:  A155747 A155748 A155749 * A155751 A155752 A155753

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, Jan 26 2009

EXTENSIONS

Edited and extended by R. J. Mathar, Feb 27 2009

STATUS

approved

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Last modified July 21 22:02 EDT 2019. Contains 325210 sequences. (Running on oeis4.)