OFFSET
1,3
EXAMPLE
(1*2*3)^2+(1*2*3)-1=41
(1*2*3)^2+(1*2*3)+1=43
41 and 43 twin primes so k(2)=1 as p(2)# =2*3
CROSSREFS
KEYWORD
nonn
AUTHOR
Pierre CAMI, Aug 17 2005
STATUS
approved