OFFSET
1,13
COMMENTS
Sequence A209063 is a subsequence which contains all (but not only) nonzero terms.
PROG
(PARI) a(n)={my(r=A004086(n=prime(n))); sum(k=1, (2*n-1)\r, isprime(abs(n-k*r)))}
CROSSREFS
KEYWORD
nonn,base
AUTHOR
M. F. Hasler, Mar 15 2012
STATUS
approved