OFFSET
7,2
LINKS
Hugo Pfoertner, Table of n, a(n) for n = 7..10000
EXAMPLE
a(7) = (17 - 15)/2 = 1,
a(8) = (19 - 15)/2 = 2,
a(9) = (23 - 21)/2 = 1,
a(10) = (29 - 21)/2 = 4.
PROG
(PARI) forprime(p=17, 500, forstep(k=p-2, 15, -2, if(omega(k)==2&&bigomega(k)==2, print1((p-k)/2, ", "); break)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Dec 12 2021
STATUS
approved