A086214 Primes of the form 3^p-2 where p is prime.

7, 241, 450283905890997361, 36472996377170786401

Offset

1,1

Comments

Sum of reciprocals = 0.1470065204505038552417181957...

The next two terms, 3^317-2 and 3^541-2, are too large to include. - Jorge Coveiro, Apr 05 2004

Links

Amiram Eldar, Table of n, a(n) for n = 1..6

Mathematica

Select[3^#-2&/@Prime[Range[20]], PrimeQ] (* Harvey P. Dale, Sep 24 2022 *)

Prog

(PARI) xtopm1(n, k, r) = { sr=0; forprime(p=2, n, y=k^p-r; if(isprime(y), print1(y", "); sr+=1./y; ); ); print(); print(sr) }

Crossrefs

Cf. A086218.

Sequence in context: A210248 A200961 A330517 * A133589 A296377 A223630

Adjacent sequences: A086211 A086212 A086213 * A086215 A086216 A086217

Keyword

nonn

Author

Cino Hilliard, Aug 28 2003

Status

approved