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 A174267 Primes p such that 5^p-4 is also prime. 0
 5, 7, 47 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA A000040 INTERSECT A059613. - R. J. Mathar, Apr 15 2010 EXAMPLE For p=5, 5^5-4=3121; p=7, 5^7-4=78121; p=47, 5^47-4= 710542735760100185871124267578121 PROG (MAGMA) [ p: p in PrimesUpTo(3500)| IsPrime(5^p-4)] (PARI) is(n)=isprime(n) && isprime(5^n-4) \\ Charles R Greathouse IV, Sep 06 2016 CROSSREFS Sequence in context: A090520 A066219 A278618 * A306649 A075830 A058313 Adjacent sequences:  A174264 A174265 A174266 * A174268 A174269 A174270 KEYWORD nonn,more,bref AUTHOR Vincenzo Librandi, Mar 14 2010 STATUS approved

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Last modified June 6 18:59 EDT 2020. Contains 334832 sequences. (Running on oeis4.)