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URL: https://oeis.org/A387392

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A387392
Numbers k such that (29^k + 3^k)/32 is prime.
0
11, 181, 229, 311, 701, 4493, 5233, 13879
OFFSET
1,1
COMMENTS
The definition implies that k must be a prime.
a(9) > 10^5.
LINKS
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.
Eric Weisstein's World of Mathematics, Repunit.
MATHEMATICA
Select[Prime[Range[10000]], PrimeQ[(29^# + 3^#)/32] &]
KEYWORD
nonn,hard,more
AUTHOR
Robert Price, Aug 28 2025
STATUS
approved