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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
CROSSREFS
Sequence in context: A255582 A254077 A352968 * A026431 A026433 A354148
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Feb 13 2009
STATUS
approved

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Last modified March 28 14:13 EDT 2024. Contains 371254 sequences. (Running on oeis4.)