A084443 Primes that can be written in more than one way as 1+p+p^k, p prime and k>0.

7, 11, 31, 131

Offset

1,1

Comments

A084440(a(n))>1; subset of A084441.

No more terms < 10^14. - David Wasserman, Dec 28 2004

Links

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

Example

prime(32) = 131 = 1+5+5^3 = 1+2+2^7, therefore 131 is a term.

Crossrefs

Cf. A102070.

Sequence in context: A293046 A213176 A236143 * A228029 A053711 A043110

Adjacent sequences: A084440 A084441 A084442 * A084444 A084445 A084446

Keyword

nonn,more

Author

Reinhard Zumkeller, May 26 2003

Status

approved