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A242177 Numbers k such that k*7^k + 1 is prime. 3
34, 1980, 9898 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..3.

G. Loeh, Generalized Cullen primes

MATHEMATICA

Select[Range[3500], PrimeQ[# 7^# + 1] &]

PROG

(MAGMA) [n: n in [0..3500] | IsPrime(n*7^n+1)];

(PARI) is(n)=ispseudoprime(n*7^n+1) \\ Charles R Greathouse IV, May 22 2017

CROSSREFS

Cf. similar sequences listed in A242176.

Sequence in context: A086881 A212023 A056566 * A187591 A160471 A252709

Adjacent sequences:  A242174 A242175 A242176 * A242178 A242179 A242180

KEYWORD

nonn,more,bref

AUTHOR

Vincenzo Librandi, May 08 2014

EXTENSIONS

a(3) from Loeh's list (see Links) - Bruno Berselli, May 08 2014

STATUS

approved

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Last modified March 31 18:53 EDT 2020. Contains 333151 sequences. (Running on oeis4.)