A075081 Perfect powers q (A001597) such that (q-1)/2 is prime.

27, 2187, 1594323, 7509466514979724803946715958257547, 13915193059764305937984450503671774362956903094027

Offset: 1

Author

Zak Seidov, Oct 16 2002

Keywords

• nonn
• hard

Comments

It can be shown that q must be of the form 3^e with e prime.

The next terms are 3^541, 3^1091, 3^1367, 3^1627, 3^4177, 3^9011, 3^9551, ...

Links

• Bo Gyu Jeong, Table of n, a(n) for n = 1..9

Crossrefs

Cf. A075079, A076481, A028491.

Extensions

Extended by Dean Hickerson, Oct 16 2002