OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..198
EXAMPLE
MAPLE
spf:= n -> add(t[1]*t[2], t=ifactors(n)[2]):
select(p -> isprime(p) and p mod spf(p-1) = 1 and p mod spf(p+1) = 1, [seq(i, i=3..6*10^6, 2)]);
CROSSREFS
KEYWORD
nonn
AUTHOR
J. M. Bergot and Robert Israel, Nov 26 2020
STATUS
approved