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A100689
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a(n) = prime(n) * 4^prime(n) - 1.
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0
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31, 191, 5119, 114687, 46137343, 872415231, 292057776127, 5222680231935, 1618481116086271, 8358680908399640575, 142962266571249025023, 698910239464707491627007, 198263834416799184651812863, 3326963855579459488791396351, 930930909542605966724141416447
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OFFSET
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1,1
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LINKS
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FORMULA
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EXAMPLE
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a(1) = 2*4^2 - 1 = 31.
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MATHEMATICA
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PROG
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(Magma) [NthPrime(n)*4^NthPrime(n) - 1: n in [1..20]]; // Vincenzo Librandi, Aug 27 2015
(PARI) vector(20, n, p=prime(n); p*4^p - 1) \\ Michel Marcus, Aug 27 2015
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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