

A294722


Numbers k such that (44^k  1)/43 is prime.


1




OFFSET

1,1


COMMENTS

The number corresponding to a(4) is a probable prime.
These are the indices of base44 repunit primes, i.e., numbers k such that A002275(k) interpreted as a base44 number and converted to decimal is prime.  Felix Fröhlich, Nov 08 2017


LINKS



MATHEMATICA

ParallelMap[ If[ PrimeQ[(44^#  1)/43], #, Nothing] &, Prime@Range @ 10000] (* Robert G. Wilson v, Nov 25 2017 *)


PROG

(PFGW) ABC2 (44^$a1)/43 // f{2*$a}
a: primes from 2 to 1000000
(PARI) is(n) = ispseudoprime((44^n1)/43) \\ Felix Fröhlich, Nov 08 2017


CROSSREFS

Cf. A028491, A004061, A004062, A004063, A004023, A005808, A004064, A016054, A006032, A006033, A006034, A006035, A127995, A127996, A127997, A127998, A127999, A098438, A128002, A128003, A128004, A128005, A240765.


KEYWORD

nonn,more


AUTHOR



STATUS

approved



