A231818 - OEIS

A231818

Least positive k such that k*n^n - 1 is a prime, or 0 if no such k exists.

3, 1, 2, 5, 6, 3, 6, 39, 18, 6, 12, 19, 8, 23, 10, 3, 76, 13, 90, 26, 52, 45, 124, 12, 60, 27, 10, 99, 126, 11, 50, 27, 28, 59, 6, 80, 122, 71, 110, 21, 72, 111, 590, 147, 178, 84, 238, 12, 138, 236, 10, 53, 6, 60, 98, 72, 620, 30, 166, 5, 98, 18, 22, 384, 126

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..65.

MATHEMATICA

Table[k = 1; While[! PrimeQ[k*n^n - 1], k++]; k, {n, 65}] (* T. D. Noe, Nov 15 2013 *)

CROSSREFS

Cf. A035092 (least k such that k*(n^2)+1 is a prime).

Cf. A175763 (least k such that k*(n^n)+1 is a prime).

Cf. A035093 (least k such that k*n!+1 is a prime).

Cf. A193807 (least k such that n*(k^2)+1 is a prime).

Cf. A231119 (least k such that n*(k^k)+1 is a prime).

Cf. A057217 (least k such that n*k!+1 is a prime).

Cf. A034693 (least k such that n*k +1 is a prime).

Cf. A231819 (least k such that k*(n^2)-1 is a prime).

Cf. A083663 (least k such that k*n!-1 is a prime).

Cf. A231734 (least k such that n*(k^2)-1 is a prime).

Cf. A231735 (least k such that n*(k^k)-1 is a prime).

Cf. A231820 (least k such that n*k!-1 is a prime).

Cf. A053989 (least k such that n*k -1 is a prime).

Sequence in context: A332319 A359753 A183386 * A280633 A084614 A050058

Adjacent sequences: A231815 A231816 A231817 * A231819 A231820 A231821

KEYWORD

nonn

AUTHOR

Alex Ratushnyak, Nov 13 2013

STATUS

approved