OFFSET
1,1
EXAMPLE
a(10) = 6 because 15 is the 10th integer such that (prime(15)+1)/phi(15) = 48/8 = 6 is an integer.
PROG
(PARI) lista(nn) = {my(p=1); for(k=1, nn, if((1+p=nextprime(p+1))%eulerphi(k) == 0, print1((p+1)/eulerphi(k), ", "))); } \\ Jinyuan Wang, Apr 06 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Jan 18 2002
EXTENSIONS
More terms from Jinyuan Wang, Apr 06 2020
STATUS
approved