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 A303091 Primes of the form 5^k + 2*k. 0
 7, 29, 131, 78139, 3814697265661, 7450580596923828179, 4336808689942017736029811203479766845703247 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(8) has 504 digits and is too large to be included. LINKS EXAMPLE 7 is a member of the sequence because 7 is a prime and 5^1 + 2*1 = 7. 29 is a member of the sequence because 29 is a prime and 5^2 + 2*2 = 29. 131 is a member of the sequence because 131 is a prime and 5^3 + 2*3 = 131. MAPLE a:=k->`if`(isprime(5^k+2*k), 5^k+2*k, NULL): seq(a(k), k=1..1500); MATHEMATICA Select[Table[5^k+2k, {k, 80}], PrimeQ] (* Harvey P. Dale, Jul 11 2021 *) PROG (GAP) Filtered(List([1..700], k ->5^k+2*k), IsPrime); CROSSREFS Cf. A299642, A299643, A297663, A303090. Sequence in context: A126394 A252832 A074468 * A333887 A179599 A266473 Adjacent sequences:  A303088 A303089 A303090 * A303092 A303093 A303094 KEYWORD nonn AUTHOR Muniru A Asiru, Apr 18 2018 STATUS approved

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Last modified November 27 20:49 EST 2021. Contains 349395 sequences. (Running on oeis4.)