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Search: id:A107770
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| A107770 |
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Numbers n such that Prime[n]-Prime[n-1] =2 |
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+0
1
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| 3, 4, 6, 8, 11, 14, 18, 21, 27, 29, 34, 36, 42, 44, 46, 50, 53, 58, 61, 65, 70, 82, 84, 90, 99, 105, 110, 114, 117, 121, 141, 143, 145, 149, 153, 172, 174, 177, 179, 183, 191
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The definition "Numbers n such that Prime[n]-Prime[n-1] =2" is wrong. This sequence are numbers n such that Prime[n] * Prime[n-1] = n*n -1. [From Ctibor O. Zizka (c.zizka(AT)email.cz), Mar 24 2009]
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MATHEMATICA
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a = Flatten[Table[If[Prime[j] - Prime[j - 1] == 2, j, {}], {j, 2, 200}]]
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CROSSREFS
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Cf. A000040.
Sequence in context: A060903 A079401 A156040 this_sequence A067054 A039893 A050115
Adjacent sequences: A107767 A107768 A107769 this_sequence A107771 A107772 A107773
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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), Jun 11 2005
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