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A084443 Primes that can be written in more than one way as 1+p+p^k, p prime and k>0. 2
7, 11, 31, 131 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 23 19:03 EDT 2021. Contains 347617 sequences. (Running on oeis4.)