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A195463
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a(n) = 4^(n+1) + 7.
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1
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11, 23, 71, 263, 1031, 4103, 16391, 65543, 262151, 1048583, 4194311, 16777223, 67108871, 268435463, 1073741831, 4294967303, 17179869191, 68719476743, 274877906951, 1099511627783, 4398046511111, 17592186044423, 70368744177671, 281474976710663
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OFFSET
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0,1
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COMMENTS
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These are the even terms of A168415. Since the odd terms of A168415 are divisible by three the primes of this sequence are the same as A104066.
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LINKS
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FORMULA
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a(n) = 4^(n+1) + 7.
G.f.: (11 - 32*x)/(1 - 5*x + 4*x^2).
a(n+1) = 4*a(n) - 21. (End)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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