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A377814
Numbers k such that (37^k - 2^k)/35 is prime.
0
3, 11, 43, 19963
OFFSET
1,1
COMMENTS
The definition implies that k must be a prime.
a(5) > 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[(37^# - 2^#)/35] &]
KEYWORD
nonn,hard,more
AUTHOR
Robert Price, Nov 08 2024
STATUS
approved