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A270927 Smallest k such that k*n^m + 1 is prime, case m=4. 1
1, 1, 2, 1, 18, 1, 6, 3, 6, 7, 46, 5, 10, 3, 8, 1, 16, 2, 28, 1, 2, 7, 16, 1, 24, 12, 10, 1, 10, 2, 6, 7, 26, 1, 12, 3, 6, 3, 8, 16, 10, 3, 22, 16, 2, 1, 6, 1, 36, 3, 6, 3, 16, 1, 18, 1, 8, 12, 16, 10, 12, 31, 2, 10, 22, 2, 36, 21, 40, 6, 12, 18, 6, 1, 6, 7, 10, 2, 18, 1, 2, 1, 22, 2, 12, 18, 6, 1, 18, 1, 58, 3, 12, 7, 24, 2, 16, 3, 16, 6, 6, 7, 46, 25, 2, 1, 12, 7, 18, 12, 46, 3, 12, 5, 10, 3, 48, 1, 16, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Zak Seidov, Table of n, a(n) for n = 1..10000

Zak Seidov,20 related sequences.

MATHEMATICA

With[{m = 4, nn = 120}, Table[SelectFirst[Range@ nn, PrimeQ[# n^m + 1] &], {n, nn}]] (* Michael De Vlieger, Mar 26 2016, Version 10 *)

PROG

(PARI) {m=4; for(n=1, 10000, k=1; while(!isprime(k*n^m+1), k++);

write("b270927.txt", n" "k))} \\ for b-file - Zak Seidov, Mar 26 2016

CROSSREFS

Cf. A034693 (m=1), A035092 (m=2), A238847 (m=3).

Sequence in context: A012895 A013077 A225768 * A089512 A300956 A089014

Adjacent sequences:  A270924 A270925 A270926 * A270928 A270929 A270930

KEYWORD

nonn

AUTHOR

Zak Seidov, Mar 26 2016

STATUS

approved

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Last modified July 17 20:45 EDT 2019. Contains 325109 sequences. (Running on oeis4.)