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A062234
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a(n) =2*prime(n) - prime(n+1).
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2
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1, 1, 3, 3, 9, 9, 15, 15, 17, 27, 25, 33, 39, 39, 41, 47, 57, 55, 63, 69, 67, 75, 77, 81, 93, 99, 99, 105, 105, 99, 123, 125, 135, 129, 147, 145, 151, 159, 161, 167, 177, 171, 189, 189, 195, 187, 199, 219, 225, 225, 227, 237, 231, 245, 251, 257, 267, 265, 273, 279
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| It is known that a(n) > 0 for all n (Tchebycheff, 1850).
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REFERENCES
| J. V. Uspensky and M. A. Heaslet, Elementary Number Theory, McGraw-Hill, NY, 1939.
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
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PROG
| (PARI) { for (n=1, 1000, write("b062234.txt", n, " ", 2*prime(n) - prime(n + 1)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 03 2009]
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CROSSREFS
| Cf. A000040.
Sequence in context: A183429 A107443 A204099 * A168329 A161828 A086739
Adjacent sequences: A062231 A062232 A062233 * A062235 A062236 A062237
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KEYWORD
| easy,nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 29 2001
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