

A302435


Number of primes of the form b^2+3 for b <= 10^n.


3




OFFSET

1,1


LINKS

Table of n, a(n) for n=1..9.


EXAMPLE

a(1) = 5 because there are 5 primes of the form b^2+3 for b <= 10: 3, 7, 19, 67 and 103.


PROG

(PARI) {a(n) = sum(k=0, 10^n, isprime(k^2+3))}


CROSSREFS

Number of primes of the form b^2+m for b <= 10^n: A302443 (m=3), A302442 (m=2), A206709 (m=1), A302434 (m=2), this sequence (m=3).
Cf. A049423.
Sequence in context: A158455 A009442 A332784 * A332467 A036688 A009348
Adjacent sequences: A302432 A302433 A302434 * A302436 A302437 A302438


KEYWORD

nonn,more


AUTHOR

Seiichi Manyama, Apr 07 2018


STATUS

approved



