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A190942 Numbers n such that 2*71^n + 1 is prime. 2
0, 3, 29, 83, 153, 327, 753, 879, 3333, 36977 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(11) > 10^5. - Robert Price, Jan 12 2016

LINKS

Table of n, a(n) for n=1..10.

Chris K. Caldwell, The List of Largest Known Primes, 2 * 71^879 + 1

Chris K. Caldwell, The List of Largest Known Primes, 2 * 71^3333 + 1

Chris K. Caldwell, The List of Largest Known Primes, 2 * 71^36977 + 1

MATHEMATICA

Select[Range[0, 10^3], PrimeQ[2*71^# + 1] &] (* Arkadiusz Wesolowski, Jul 29 2011 *)

PROG

(MAGMA) [n : n in [0..10^3] | IsPrime(2*71^n+1)]; // Arkadiusz Wesolowski, Jul 29 2011

(PARI) for(n=0, 10^3, if(isprime(2*71^n+1), print1(n, ", "))) \\ Arkadiusz Wesolowski, Jul 29 2011

CROSSREFS

Cf. A141774, A141798.

Sequence in context: A221745 A087210 A288918 * A106943 A281712 A106942

Adjacent sequences:  A190939 A190940 A190941 * A190943 A190944 A190945

KEYWORD

nonn,hard,more

AUTHOR

Arkadiusz Wesolowski, May 24 2011

STATUS

approved

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Last modified October 23 16:46 EDT 2019. Contains 328373 sequences. (Running on oeis4.)