A228030 Primes of the form 7^n + 6.

7, 13, 349, 33232930569607, 2651730845859653471779023381607

Offset: 1

Author

Vincenzo Librandi, Aug 11 2013

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..7

Crossrefs

Cf. A217130 (associated n).

Cf. Primes of the form k^n + h: A092506 (k=2, h=1), A057733 (k=2, h=3), A123250 (k=2, h=5), A104066 (k=2, h=7), A104070 (k=2, h=9), A057735 (k=3, h=2), A102903 (k=3, h=4), A102870 (k=3, h=8), A102907 (k=3, h=10), A290200 (k=4, h=1), A182330 (k=5, h=2), A102910 (k=5, h=8), A182331 (k=6, h=1), A104118 (k=6, h=5), A104115 (k=6, h=7), A104065 (k=7, h=4), this sequence (k=7, h=6), A144360 (k=8, h=7), A145440 (k=8, h=9), A228034 (k=9, h=2), A159352 (k=10, h=3), A159031 (k=10, h=7).

Programs

Magma

[a: n in [0..300] | IsPrime(a) where a is  7^n+6];

Mathematica

Select[Table[7^n + 6, {n, 0, 300}], PrimeQ]

Extensions

Corrected cross-references - Robert Price, Aug 01 2017