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A057191
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Numbers n such that (25^n+1)/26 is a prime.
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18
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3, 7, 23, 29, 59, 1249, 1709, 1823, 1931, 3433, 8863, 43201, 78707
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OFFSET
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1,1
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COMMENTS
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Some of the larger terms may only correspond to probable primes.
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LINKS
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MATHEMATICA
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Select[Range[0, 2000], PrimeQ[(25^# + 1) / 26] &] (* Vincenzo Librandi, Oct 29 2017 *)
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PROG
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(PARI) isok(n) = (denominator(p=(25^n+1)/26)==1) && isprime(p); \\ Michel Marcus, Oct 29 2017
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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