

A096819


Exponents n such that 2^n19 is prime.


11



5, 7, 11, 15, 19, 21, 31, 39, 67, 69, 85, 157, 171, 191, 255, 291, 379, 3669, 4551, 9531, 13119, 14211, 20647, 233965, 337267
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

All terms are odd since for even n, 2^n19 is divisible by 3.


LINKS

Table of n, a(n) for n=1..25.
Search for 2^n19, PRP Top Records


EXAMPLE

n=7: 12819=109 is prime.


MATHEMATICA

Select[Range[5, 20000], PrimeQ[2^#19]&] (* Vladimir Joseph Stephan Orlovsky, Feb 27 2011*)


CROSSREFS

Exponents for primes of 2^nd form: A000043 (d=1), A050414 (d=3), A059608 (d=5), A059609 (d=7), A059610 (d=9), A096817 (d=11), A096818 (d=13), A059612 (d=15), A059611 (d=17), A096819 (d=19), A096820 (d=21).
Cf. A096502
Sequence in context: A134643 A039001 A023741 * A032699 A073088 A054059
Adjacent sequences: A096816 A096817 A096818 * A096820 A096821 A096822


KEYWORD

nonn,more


AUTHOR

Labos Elemer, Jul 13 2004


EXTENSIONS

a(22)a(23) from Max Alekseyev, a(24)a(25) from Lelio R Paula, added by Max Alekseyev, Feb 10 2012, Oct 24 2013


STATUS

approved



