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A139241
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Second differences of Mersenne numbers A001348.
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4
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20, 72, 1824, 4224, 116736, 270336, 7471104, 520617984, 1082130432, 133680857088, 1926292832256, 4535485464576, 125344325566464, 8734520371052544, 558587091282296832, 1161928703861587968, 143538727323552448512, 2068341179264683474944, 4869940435459321626624
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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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a(n) = 2^prime(n+2)-2^(prime(n+1)+1)+2^prime(n). - Michel Marcus, Mar 13 2020
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MATHEMATICA
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Differences[2^Prime[Range[25]]-1, 2] (* Paolo Xausa, Oct 20 2023 *)
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PROG
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(PARI) a(n) = 2^prime(n+2)-2^(prime(n+1)+1)+2^prime(n); \\ Michel Marcus, Mar 13 2020
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CROSSREFS
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KEYWORD
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easy,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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