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Search: id:A096819
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| A096819 |
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Exponents n such that 2^n-19 is prime. |
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+0
4
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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
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OFFSET
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1,1
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COMMENT
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Exponents for primes of 2^n-d form if d=1,3,5,7,11,13,15,17,19,21 found at: A000043 (1); A050414 (3); A059608 (5); A059609 (7); A059610 (9); A096817 (11); A096818 (13); A059612 (15); A059611 (17); A096819 (19); A096820 (21); While at d=1 all exponents are primes, for d=6,19 seems to be all odd, for d=11,17 appears to be even and for others no rule I observed.
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EXAMPLE
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n=7: 128-19=109 is prime.
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CROSSREFS
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Cf. A000043(1); A050414(3); A059608(5); A059609(7); A059610(9); A096817(11); A096818(13); A059612(15); A059611(17); A096819(19); A096820(21); A096502[min].
Sequence in context: A134643 A039001 A023741 this_sequence A032699 A073088 A054059
Adjacent sequences: A096816 A096817 A096818 this_sequence A096820 A096821 A096822
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jul 13 2004
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