A057180 Numbers k such that (14^k + 1)/15 is a prime.
7, 53, 503, 1229, 22637, 1091401, 1385203, 1522841, 2307467
Offset: 1
Links
- Paul Bourdelais, A Generalized Repunit Conjecture
- J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
- H. Dubner and T. Granlund, Primes of the Form (b^n+1)/(b+1), J. Integer Sequences, 3 (2000), #P00.2.7.
- H. Lifchitz, Mersenne and Fermat primes field
Programs
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Prime95
PRP=1,14,1091401,1,0,0,"15"
Extensions
a(5) from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
a(6) from Paul Bourdelais, Mar 10 2014
a(7) from Paul Bourdelais, Feb 08 2022
a(8) from Paul Bourdelais, Feb 18 2025
a(9) from Paul Bourdelais, Jun 03 2025