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A099047 Numbers n such that n-1 and n+1 are both composite. +0
1
5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 26, 27, 29, 31, 33, 34, 35, 37, 39, 41, 43, 45, 47, 49, 50, 51, 53, 55, 56, 57, 59, 61, 63, 64, 65, 67, 69, 71, 73, 75, 76, 77, 79, 81, 83, 85, 86, 87, 89, 91, 92, 93, 94, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 116, 117 (list; graph; listen)
OFFSET

1,1

PROGRAM

(PARI) for(n=5, 200, if(!isprime(n-1)&&!isprime(n+1), print1(n, ", ")))

CROSSREFS

Sequence in context: A128163 A106505 A097985 this_sequence A084926 A049013 A062545

Adjacent sequences: A099044 A099045 A099046 this_sequence A099048 A099049 A099050

KEYWORD

nonn

AUTHOR

Rick L. Shepherd (rshepherd2(AT)hotmail.com), Nov 13 2004

page 1

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.


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