A291861 Prime numbers of the form 7^k - 6.

43, 337, 117643, 40353601, 558545864083284001, 1341068619663964900801, 7730993719707444524137094401, 256923577521058878088611477224235621321601, 4318114567396436564035293097707728087552248843

Offset: 1

Author

Robert Price, Sep 04 2017

Keywords

• nonn

Links

• Robert Price, Table of n, a(n) for n = 1..10
• F. Firoozbakht and M. F. Hasler, Variations on Euclid's formula for Perfect Numbers, JIS 13 (2010) #10.3.1.
• Henri & Renaud Lifchitz, PRP Records
• OpenPFGW Project, Primality Tester

Crossrefs

Cf. A191469.

Programs

Mathematica

Select[Table[7^k - 6, {k, 1, 100}], PrimeQ[#] &]