OFFSET
1,1
FORMULA
Min{p|p and q=(p-2n+1)/2, p and q are primes}
EXAMPLE
n=8, 2n-1=15, a(8)=541 because (541-15)/2=263 is the corresponding generalized Sophie Germain prime and {541,263} is the smallest pair belonging to 15.
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Feb 26 2001
STATUS
approved