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A301635 Numbers k such that 5^k + 5*k + 1 is prime. 3
0, 1, 11, 25, 35, 85, 499, 1403, 3511, 3739, 8005 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Next term, if it exists, is greater than 20000. - Vaclav Kotesovec, Mar 25 2018

LINKS

Table of n, a(n) for n=1..11.

MATHEMATICA

Flatten[{0, Select[Range[1000], PrimeQ[5^# + 5*# + 1] &]}] (* Vaclav Kotesovec, Mar 25 2018 *)

PROG

(PARI) for(n=0, 500, if(isprime(5^n+5*n+1), print1(n", ")))

CROSSREFS

A301638 gives the primes.

Cf. A171058, A301634.

Sequence in context: A084547 A125868 A240895 * A031025 A140675 A161532

Adjacent sequences:  A301632 A301633 A301634 * A301636 A301637 A301638

KEYWORD

nonn,more

AUTHOR

Seiichi Manyama, Mar 25 2018

EXTENSIONS

a(8)-a(11) from Vaclav Kotesovec, Mar 25 2018

STATUS

approved

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Last modified January 20 05:31 EST 2020. Contains 331067 sequences. (Running on oeis4.)