A128003 Numbers n such that (37^n - 1)/36 is prime.
13, 71, 181, 251, 463, 521, 7321, 36473, 48157, 87421, 168527, 249341
Offset: 1
Links
- H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930.
- H. Lifchitz, Mersenne and Fermat primes field
- Index to primes in various ranges, form ((k+1)^n-1)/k
Programs
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Mathematica
Select[Prime[Range[100]], PrimeQ[(37^#-1)/36]&]
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PARI
is(n)=ispseudoprime((37^n-1)/36) \\ Charles R Greathouse IV, Feb 17 2017
Extensions
a(7) from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
a(8)-a(10) from Robert Price, Mar 18 2012
a(11) from Paul Bourdelais, Aug 05 2019
a(12) from Paul Bourdelais, Aug 04 2020
Comments