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A105181 Numbers n such that 2^(2*(n+1)) + 2^n - 1 is prime. +0
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1, 2, 3, 4, 5, 6, 8, 10, 14, 22, 38, 42, 71, 118, 128, 159, 179, 214, 484, 951, 1148, 1162, 1427, 1532, 1692, 1861, 2261, 3760, 4575, 6974, 7295, 8367, 8463, 8600, 14878, 16165 (list; graph; listen)
OFFSET

1,2

EXAMPLE

2^4+2^1+1=19 prime so a(1)=1

2^6+2^2+1=67 prime so a(2)=2

2^8+2^3+1=263 prime so a(3)=3

CROSSREFS

Adjacent sequences: A105178 A105179 A105180 this_sequence A105182 A105183 A105184

Sequence in context: A086736 A017846 A129976 this_sequence A096120 A050030 A046889

KEYWORD

more,nonn

AUTHOR

Pierre CAMI (pierrecami(AT)tele2.fr), Apr 11 2005

EXTENSIONS

More terms from Ryan Propper (rpropper(AT)cs.stanford.edu), Jan 31 2008

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Last modified October 13 09:05 EDT 2008. Contains 145008 sequences.


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