

A271981


Primes p such that p + 40 is also prime.


3



3, 7, 13, 19, 31, 43, 61, 67, 73, 97, 109, 127, 139, 151, 157, 193, 199, 211, 223, 229, 241, 271, 277, 307, 313, 349, 379, 409, 421, 439, 463, 523, 547, 577, 601, 607, 613, 619, 643, 661, 733, 757, 769, 787, 823, 907, 937, 991, 1009, 1021, 1051, 1063, 1069
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OFFSET

1,1


COMMENTS

A126721 is a subsequence of this sequence.


LINKS

Karl V. Keller, Jr., Table of n, a(n) for n = 1..10000


EXAMPLE

3 is a term since 3 + 40 = 43 is also prime.
7 is a term since 7 + 40 = 47 is also prime.


MAPLE

q:= n> andmap(isprime, [n, n+40]):
select(q, [$2..2000])[]; # Alois P. Heinz, Jul 21 2022


MATHEMATICA

Select[Prime@ Range@ 180, PrimeQ[# + 40] &] (* Michael De Vlieger, Apr 18 2016 *)


PROG

(Python)
from sympy import isprime
for i in range(3, 2001, 2):
if isprime(i) and isprime(i+40): print (i, end=', ')
(PARI) lista(nn) = forprime(p=2, nn, if (isprime(p+40), print1(p, ", "))); \\ Michel Marcus, Apr 19 2016


CROSSREFS

Cf. A000040, A126721.
Sequence in context: A167473 A256864 A231432 * A103521 A103966 A023237
Adjacent sequences: A271978 A271979 A271980 * A271982 A271983 A271984


KEYWORD

nonn


AUTHOR

Karl V. Keller, Jr., Apr 17 2016


STATUS

approved



