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A156657 Numbers that are not safe primes. 3
0, 1, 2, 3, 4, 6, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A156659(a(n)) = 0; complement of A005385; A059456 is a subsequence;

A010051(a(n))*A010051((a(n)-1)/2) = 0.

LINKS

Table of n, a(n) for n=1..72.

CROSSREFS

Sequence in context: A121217 A255582 A254077 * A026431 A026433 A015858

Adjacent sequences:  A156654 A156655 A156656 * A156658 A156659 A156660

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Feb 13 2009

STATUS

approved

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Last modified August 18 13:28 EDT 2018. Contains 313832 sequences. (Running on oeis4.)