

A050848


Numbers k such that 193*2^k1 is prime.


0



3, 15, 27, 63, 87, 135, 543, 1383, 1455, 7767, 18543, 22143, 40967, 198719, 405483, 439107, 880287
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OFFSET

1,1


LINKS



MATHEMATICA

Select[Range[1000], PrimeQ[193*2^#  1] & ] (* Robert Price, Dec 29 2018 *)


PROG



CROSSREFS



KEYWORD

hard,nonn,more


AUTHOR



EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
a(17) from the Wilfrid Keller link by Robert Price, Dec 29 2018


STATUS

approved



