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A105443
a(n) = the smallest prime p such that p+4 and q+4 are prime; q is the n-th prime after p.
3
3, 67, 3, 43, 3, 37, 7, 79, 3, 19, 3, 13, 19, 7, 13, 3, 7, 13, 3, 7, 79, 3, 43, 3, 37, 3, 79, 3, 19, 67, 13, 673, 7, 229, 3, 79, 13, 127, 7, 79, 3, 79, 7, 43, 3, 37, 3, 43, 97, 19, 163, 13, 127, 7, 43, 3, 37, 7, 97, 3, 19, 3, 13, 97, 7, 19, 3, 13, 19, 7, 13, 3, 7, 277, 3, 19, 37, 13
OFFSET
2,1
EXAMPLE
a(2)=3 because 3+4 and 7+4 are primes.
CROSSREFS
KEYWORD
nonn
AUTHOR
Cino Hilliard, May 02 2005
EXTENSIONS
Edited by Don Reble, Jun 11 2007
STATUS
approved