A368202 Least k such that 6*n*k+1 is a prime.

1, 1, 1, 3, 1, 1, 1, 2, 2, 1, 1, 1, 1, 4, 2, 1, 1, 1, 2, 2, 1, 3, 1, 3, 1, 1, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 1, 1, 4, 1, 3, 3, 4, 5, 1, 1, 1, 2, 3, 2, 1, 1, 10, 4, 1, 1, 6, 1, 2, 5, 1, 1, 1, 2, 3, 1, 4, 1, 2, 1, 2, 1, 1, 4, 4, 1, 1, 2, 3, 7, 1, 6, 1, 2, 2, 2

Offset

1,4

Links

Robert Price, Table of n, a(n) for n = 1..5000

Mathematica

A368202 = {};
Do[k=1; While[!PrimeQ[9 n k+1], k++]; AppendTo[A368202, k], {n, 86}];
A368202

Prog

(PARI) a(n) = my(k=1); while (!isprime(6*n*k+1), k++); k; \\ Michel Marcus, Dec 16 2023

Crossrefs

Cf. A016014, A024899.

A070850 lists the corresponding primes.

Sequence in context: A359635 A065372 A015137 * A136148 A178252 A338199

Adjacent sequences: A368199 A368200 A368201 * A368203 A368204 A368205

Keyword

nonn

Author

Robert Price, Dec 16 2023

Status

approved