1,1

I proved that there is no prime p such that p^2 divides p.p.

All primes of the forms 10^(2m)-10^m+1 or 1/3*(10^(2m)+10^m+1) are in

the sequence.

Cf. A147553.

Sequence in context: A120479 A146227 A019007 this_sequence A076800 A054975 A072790

Adjacent sequences: A147551 A147552 A147553 this_sequence A147555 A147556 A147557

base,more,nonn

Farideh Firoozbakht (mymontain(AT)yahoo.com), Dec 26 2008