A191409 Primes of the form n*(n-1)^n-(n-1)*n^(n-1)-1.

5, 131, 54869, 863585783, 174960197237646244878763893842845824429634127969

Offset: 1

Author

Juri-Stepan Gerasimov, Jun 12 2011

Keywords

• nonn

Comments

a(6) and a(7) have 427 and 1773 digits, respectively, and are thus too large to include.

Examples

			a(1)=5 (=3*2^3-2*3^2-1), a(2)=131 (=4*3^4-3*4^3-1), a(3)=54869 (=6*5^6-5*6^5-1), a(4)=863585783 (=9*8^9-8*9^8-1).
		

Crossrefs

Cf. A191699 (associated n).

Programs

Mathematica

Select[Table[n(n-1)^n-(n-1)n^(n-1)-1,{n,200}],PrimeQ] (* Harvey P. Dale, Jun 19 2011 *)