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URL: https://oeis.org/A302443

⇱ A302443 - OEIS

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A302443
Number of primes of the form b^2-3 for b <= 10^n.
3
3, 19, 119, 849, 6663, 54514, 460019, 3982973, 35174007
OFFSET
1,1
EXAMPLE
a(1) = 3 because there are 3 primes of the form b^2-3 for b <= 10 : 13, 61 and 97.
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: this sequence (m=-3), A302442 (m=-2), A206709 (m=1), A302434 (m=2), A302435 (m=3).
Cf. A028874.
Sequence in context: A221184 A274852 A139176 * A126809 A340644 A020073
KEYWORD
nonn,more
AUTHOR
Seiichi Manyama, Apr 08 2018
STATUS
approved