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A120382 Even numbers n such that 3*n-1 and 3*n+1 are not prime. 0
40, 48, 62, 68, 72, 82, 96, 100, 108, 114, 138, 142, 158, 172, 176, 178, 184, 194 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..18.

CROSSREFS

Sequence in context: A197734 A114839 A179435 * A290017 A062909 A167327

Adjacent sequences:  A120379 A120380 A120381 * A120383 A120384 A120385

KEYWORD

easy,nonn

AUTHOR

Pierre CAMI, Jun 29 2006

STATUS

approved

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Last modified April 20 16:17 EDT 2019. Contains 322310 sequences. (Running on oeis4.)