A155838 Primes p such that p^2 divides A085606(2p-2) = (2p-3)^(2p-2) - 1.

2, 5, 13, 61681, 1235573, 27544452149

Offset

1,1

Comments

For p>3, (2p-3)^(2p-2) - 1 is divisible by p.

Primes p such that 3^p == 3-2p (mod p^2).

No other terms below 10^11.

Links

Table of n, a(n) for n=1..6.

Crossrefs

Cf. A085606.

Sequence in context: A128772 A272106 A190478 * A166405 A226505 A370235

Adjacent sequences: A155835 A155836 A155837 * A155839 A155840 A155841

Keyword

hard,more,nonn

Author

Alexander Adamchuk, Jan 28 2009

Extensions

27544452149 from Max Alekseyev, Oct 14 2009

Status

approved