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Search: id:A111209
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| A111209 |
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Difference between the primes and powers of two. |
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+0
1
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| 0, 1, 3, 9, 21, 51, 111, 237, 489, 995, 2017, 4059, 8151, 16341, 32721, 65483, 131013, 262083, 524221, 1048505, 2097079, 4194225, 8388525, 16777127, 33554335
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OFFSET
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1,3
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COMMENT
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Suggested by the irrational Sum: 1+Sum[1/(2^n+Prime[n]),{n,1,Infinity}]
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FORMULA
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a(n) = 2^n-Prime[n]
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MATHEMATICA
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a = Table[2^n - Prime[n], {n, 1, 25}]
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CROSSREFS
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Adjacent sequences: A111206 A111207 A111208 this_sequence A111210 A111211 A111212
Sequence in context: A056823 A105544 A119917 this_sequence A109755 A005254 A007056
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KEYWORD
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nonn
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Oct 25 2005
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