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A086214
Primes of the form 3^p-2 where p is prime.
3
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
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
KEYWORD
nonn
AUTHOR
Cino Hilliard, Aug 28 2003
STATUS
approved