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

7, 281, 1602529

Offset

1,1

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

Mathematica

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

Crossrefs

Cf. A061421

Sequence in context: A062646 A009503 A209889 * A096548 A160072 A137435

Adjacent sequences: A176069 A176070 A176071 * A176073 A176074 A176075

Keyword

nonn,bref

Author

Vladimir Joseph Stephan Orlovsky, Apr 07 2010

Status

approved