A176072 Primes of the form 3^k + 2^k + k + 1.

7, 281, 1602529

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, Apr 07 2010

Keywords

• nonn
• bref

Comments

The next term is too large to include here.

281 = 3^5 + 2^5 + 5 + 1,..

The corresponding values of k are 1, 5, 13, 905, 5341, ... ; a(5) ~ 2.016...*10^2548. - Amiram Eldar, Jul 18 2019

Links

• Amiram Eldar, Table of n, a(n) for n = 1..4

Crossrefs

Cf. A061421

Programs

Mathematica

Select[Array[3^#+2^#+#+1&,2*6! ],PrimeQ[ # ]&]