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Search: id:A164523
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| A164523 |
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Non-negative numbers n such that 6*2^n-1 is prime. |
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+0
1
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| 0, 1, 2, 3, 5, 6, 10, 17, 33, 37, 42, 54, 63, 75, 93, 102, 142, 205, 215, 305, 323, 390, 457, 469, 826, 1273, 3275
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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The associated primes are in A007505.
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FORMULA
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a(n) = A002235(n+1)-1. [R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 17 2009]
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EXAMPLE
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n=0 is in the sequence because 6*2^0-1=5 is prime. n=1 is in the sequence because 6*2^1-1=11 is prime.
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CROSSREFS
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Sequence in context: A018255 A018727 A161715 this_sequence A033159 A083710 A127524
Adjacent sequences: A164520 A164521 A164522 this_sequence A164524 A164525 A164526
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 15 2009
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 17 2009
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