1,1

The next term a(6)=883^884-884^883 has 2605 decimal digits.

a(2)=162287 because A007925(A072179(2))=6^7-7^6=162287 is prime.

Cf. A007925 n^(n+1)-(n+1)^n, A072179 n^(n+1)-(n+1)^n is prime, A099497 n^(n+1)-(n+1)^n is a semiprime, A099495 semiprimes of the form n^(n+1)-(n+1)^n.

Adjacent sequences: A099496 A099497 A099498 this_sequence A099500 A099501 A099502

Sequence in context: A078351 A046883 A046884 this_sequence A051157 A130653 A125039

nonn

Hugo Pfoertner (hugo(AT)pfoertner.org), Oct 19 2004