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Search: id:A110930
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| A110930 |
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a(1) = 1; a(n) = nextprime(2*a(n-1)) for n > 1. |
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1
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| 1, 3, 7, 17, 37, 79, 163, 331, 673, 1361, 2729, 5471, 10949, 21911, 43853, 87719, 175447, 350899, 701819, 1403641, 2807303, 5614657, 11229331, 22458671, 44917381, 89834777, 179669557, 359339171, 718678369, 1437356741, 2874713497
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=A065545(n-1), n>1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 18 2008]
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EXAMPLE
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a(6) = nextprime(2*a(5)) = nextprime(2*37) = nextprime(74) = 79.
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MATHEMATICA
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<<NumberTheory`; p = 1; Print[p]; Do[p = NextPrime[2*p]; Print[p], {n, 2, 50}]
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CROSSREFS
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Sequence in context: A089099 A089116 A065545 this_sequence A026646 A026668 A111210
Adjacent sequences: A110927 A110928 A110929 this_sequence A110931 A110932 A110933
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KEYWORD
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nonn
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AUTHOR
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Ryan Propper (rpropper(AT)stanford.edu), Sep 23 2005
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