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A365958
Least k such that 8*n*k+1 is a prime.
1
2, 1, 3, 3, 1, 2, 2, 3, 1, 3, 1, 1, 3, 1, 2, 2, 1, 3, 3, 4, 2, 2, 7, 1, 2, 6, 2, 2, 1, 1, 6, 1, 5, 5, 1, 2, 2, 4, 1, 2, 7, 1, 3, 1, 5, 9, 3, 2, 8, 1, 1, 3, 4, 1, 2, 1, 1, 2, 4, 7, 2, 3, 2, 15, 1, 4, 3, 10, 3, 5, 1, 1, 3, 1, 1, 2, 1, 2, 6, 1, 2, 12, 3, 1, 2
OFFSET
1,1
LINKS
MATHEMATICA
A365958 = {};
Do[k=1; While[!PrimeQ[8 n k+1], k++]; AppendTo[A365958 , k], {n, 85}];
PROG
(PARI) a(n) = my(k=1); while (!isprime(8*n*k+1), k++); k; \\ Michel Marcus, Dec 17 2023
CROSSREFS
A070852 lists the corresponding primes.
Sequence in context: A245554 A110569 A140815 * A351963 A134840 A352356
KEYWORD
nonn
AUTHOR
Robert Price, Dec 17 2023
STATUS
approved