A112406 a(n) = (n+1)^((n+1)^n) - n^(n^(n-1)).

1, 3, 19679, 340282366920938463463374607431768191773

Offset

1,2

Comments

First differences of A053015. Since a(2) = 3 is prime, a(3) = 19679 is semiprime and a(4) has 6 prime factors. - Jonathan Vos Post, Dec 11 2005

Links

Table of n, a(n) for n=1..4.

Formula

Equally, 1-0, (2^2)-1, (3^3)^3 - 2^2, ((4^4)^4)^4 - (3^3)^3, ...

Crossrefs

Cf. A053015.

Sequence in context: A182914 A203182 A128121 * A344681 A171364 A307670

Adjacent sequences: A112403 A112404 A112405 * A112407 A112408 A112409

Keyword

nonn

Author

Daniel Kiteck, Dec 07 2005

Status

approved