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A158910 First Differences of A061240. 3
18, 18, 18, 54, 18, 18, 18, 72, 18, 36, 18, 36, 36, 18, 18, 72, 18, 54, 36, 18, 36, 90, 18, 36, 90, 54, 36, 36, 18, 18, 54, 90, 36, 54, 18, 18, 54, 36, 18, 54, 18, 54, 18, 36, 90, 36, 54, 36, 54, 36, 18, 18, 54, 36, 72, 18, 108, 36, 36, 72, 18, 18, 126, 36, 54, 54, 54, 36, 126 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Since A061240 contains prime numbers of the form 9k+5, k even, all numbers here are multiples of 18.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Differences[Select[Prime[Range[500]], Mod[#, 9]==5&]] (* Harvey P. Dale, May 19 2018 *)

CROSSREFS

Cf. A008600.

Sequence in context: A278716 A282814 A010857 * A243097 A040307 A022352

Adjacent sequences:  A158907 A158908 A158909 * A158911 A158912 A158913

KEYWORD

nonn,less

AUTHOR

Paul Curtz, Mar 30 2009

EXTENSIONS

Edited and extended by R. J. Mathar, Apr 03 2009

STATUS

approved

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Last modified April 19 00:18 EDT 2021. Contains 343098 sequences. (Running on oeis4.)