OFFSET
1,1
COMMENTS
Complement of A291691 w.r.t. primes.
Are there infinitely many such primes? - Thomas Ordowski, Sep 12 2017
EXAMPLE
For p=17, we have gpf(lpf(2^p - 1) - 1) = 257 which is > 17, so 17 is a term.
PROG
(PARI) lista(nn) = forprime(p=2, nn, if (vecmax(factor(vecmin(factor(2^p-1)[, 1])-1)[, 1]) > p, print1(p, ", ")); );
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Sep 12 2017
STATUS
approved