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A039915
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Smallest k such that k(p-1)-1 is positive and divisible by p where p = n-th prime.
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4
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3, 2, 4, 6, 10, 12, 16, 18, 22, 28, 30, 36, 40, 42, 46, 52, 58, 60, 66, 70, 72, 78, 82, 88, 96, 100, 102, 106, 108, 112, 126, 130, 136, 138, 148, 150, 156, 162, 166, 172, 178, 180, 190, 192, 196, 198, 210, 222, 226, 228, 232, 238, 240, 250, 256, 262, 268, 270
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Also smallest positive k such that the k-th triangular number is divisible by the n-th prime. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 19 2002
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..1000
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FORMULA
| a(n) = p+(-1)^p. - Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), May 26 2009
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EXAMPLE
| a(1)=3 because 3(2-1)-1=2 is divisible by 2.
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CROSSREFS
| Cf. A000217, A039678. Essentially the same as A006093.
Sequence in context: A019653 A095258 A114745 * A085346 A121861 A060006
Adjacent sequences: A039912 A039913 A039914 * A039916 A039917 A039918
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KEYWORD
| nice,nonn
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AUTHOR
| Felice Russo (frusso(AT)micron.com)
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EXTENSIONS
| Edited and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 06 2008
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