OFFSET
1,1
EXAMPLE
sigma(2312) - phi(2312) = 3517 is prime, so is in the sequence.
PROG
(PARI) lista(nn) = {for (k = 1, nn, if (isprime(p = (sigma(k) - eulerphi(k))) && (p % 2), print1(p, ", ")); ); } \\ Michel Marcus, Nov 24 2013
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Mar 02 2002
EXTENSIONS
Terms 3517, 10169, 9817 added by Michel Marcus, Nov 24 2013
STATUS
approved