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A096819
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Exponents n such that 2^n-19 is prime.
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9
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5, 7, 11, 15, 19, 21, 31, 39, 67, 69, 85, 157, 171, 191, 255, 291, 379, 3669, 4551, 9531, 13119, 14211, 20647, 337267
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| All terms are odd since for even n, 2^n-19 is divisible by 3.
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LINKS
| Search for 2^n-19, PRP Top Records
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EXAMPLE
| n=7: 128-19=109 is prime.
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MATHEMATICA
| Select[Range[5, 20000], PrimeQ[2^#-19]&] (*From Vladimir Joseph Stephan Orlovsky, Feb 27 2011*)
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CROSSREFS
| Exponents for primes of 2^n-d 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
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KEYWORD
| nonn,more,changed
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Jul 13 2004
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EXTENSIONS
| a(22)-a(23) from Max Alekseyev, a(24) from Lelio R Paula, added by Max Alekseyev (maxale(AT)gmail.com), Feb 10 2012
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