

A301635


Numbers k such that 5^k + 5*k + 1 is prime.


3



0, 1, 11, 25, 35, 85, 499, 1403, 3511, 3739, 8005
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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



