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A143429
Least a(n) prime == 1 mod 6 such that q(n)*(q(n)+a(n))-1 is prime with q(i)=i-th prime == -1 mod 6.
4
7, 7, 13, 13, 13, 13, 13, 31, 31, 19, 31, 7, 19, 7, 43, 7, 7, 13, 13, 7, 13, 61, 43, 7, 31, 37, 37, 13, 151, 19, 13, 13, 7, 67, 13, 7, 19, 13, 7, 13, 43, 73, 43, 19, 13, 67, 43, 13, 13, 7, 7, 13, 31, 73, 19, 7, 31, 43, 31, 67, 7, 31, 37, 13, 31, 7, 37, 7, 103, 43, 13, 13, 19, 13, 43, 7
OFFSET
1,1
EXAMPLE
q(1)=5 5*(5+7)-1=59 prime so a(1)=7
q(2)=11 11*(11+7)=197 prime so a(2)=7
CROSSREFS
KEYWORD
nonn
AUTHOR
Pierre CAMI, Aug 14 2008
STATUS
approved