

A108254


Numbers k such that little googol  k is prime.


2



15, 99, 153, 183, 267, 285, 357, 479, 603, 833, 843, 879, 1107, 1125, 1187, 1235, 1289, 1295, 1683, 1757, 1763, 1833, 1863, 1905, 1929, 1943, 1977, 2609, 2699, 2709, 2933, 2973, 2975, 2999, 3027, 3135, 3183, 3237, 3347, 3375, 3485, 3503, 3507, 3555, 3647
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OFFSET

1,1


COMMENTS

A little googol = 2^100.
The sequence is finite with between 1.8559e29 and 1.8562e29 members. Under the Riemann Hypothesis, it has between 1.8560140176089e29 and 1.8560140176096e29 members.  Charles R Greathouse IV, Jul 30 2007


LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000


MATHEMATICA

Select[Range[4000], PrimeQ[2^100  #] &] (* Amiram Eldar, Dec 26 2019 *)


PROG

(PARI) g(n) = forstep(x=1, n, 2, if(isprime(2^100x), print1(x", ")))


CROSSREFS

Cf. A108253.
Sequence in context: A278203 A159528 A108681 * A174383 A341396 A307158
Adjacent sequences: A108251 A108252 A108253 * A108255 A108256 A108257


KEYWORD

nonn,fini


AUTHOR

Cino Hilliard, Jun 18 2005


STATUS

approved



