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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

Table of n, a(n) for n=1..7.

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);

PROG

(GAP) Filtered(List([1..700], k ->5^k+2*k), IsPrime);

CROSSREFS

Cf. A299642, A299643, A297663, A303090.

Sequence in context: A126394 A252832 A074468 * A179599 A266473 A297677

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 January 23 01:48 EST 2020. Contains 331166 sequences. (Running on oeis4.)