A134985 Numbers k such that (k-1)^(k+1) - k^k is prime.

5, 6, 7, 13, 17, 171, 174, 378, 17641

Offset

1,1

Comments

No more terms up to 10000. - Rick L. Shepherd, May 16 2008

Links

Table of n, a(n) for n=1..9.

Example

12^14 - 13^13 = 981043357956611, which is prime, so 13 is in the list.

Mathematica

Select[Table[n, {n, 5, 400}], PrimeQ[(#-1)^(#+1)-#^#]&] (* Vladimir Joseph Stephan Orlovsky, Mar 03 2011*)

Crossrefs

Sequence in context: A273929 A067531 A031029 * A371029 A111018 A326132

Adjacent sequences: A134982 A134983 A134984 * A134986 A134987 A134988

Keyword

hard,more,nonn

Author

Carl R. White, Feb 05 2008

Extensions

a(9) from Michael S. Branicky, Sep 05 2024

Status

approved