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Search: id:A008837
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| 1, 3, 10, 21, 55, 78, 136, 171, 253, 406, 465, 666, 820, 903, 1081, 1378, 1711, 1830, 2211, 2485, 2628, 3081, 3403, 3916, 4656, 5050, 5253, 5671, 5886, 6328, 8001, 8515, 9316, 9591, 11026, 11325, 12246, 13203, 13861, 14878, 15931
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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MATHEMATICA
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Table[Prime[n]*(Prime[n]-1)/2, {n, 1, 22}] (from Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 29 2008)
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PROGRAM
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(MAGMA) [ (k-1)*k/2 where k is NthPrime(n): n in [1..44] ]; [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Nov 18 2008]
(PARI) { n=0; forprime (p=2, prime(1000), write("b008837.txt", n++, " ", p*(p - 1)/2) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 25 2009]
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CROSSREFS
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Cf. A000217 (triangular numbers), A112456 (least triangular number divisible by n-th prime). [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Nov 18 2008]
Sequence in context: A117495 A007687 A006308 this_sequence A081950 A071563 A139116
Adjacent sequences: A008834 A008835 A008836 this_sequence A008838 A008839 A008840
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Ken Levasseur (LEVASSEUK(AT)woods.uml.edu)
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EXTENSIONS
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OFFSET changed from 2,2 to 1,2 by Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 25 2009
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