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Search: id:A152622
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| A152622 |
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Tetrahedral numbers n*(n+1)*(n+2)/6 with n, n+1 and n+2 nonprime. |
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+0
4
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| 120, 560, 1540, 2600, 2925, 3276, 5984, 6545, 7140, 9880, 15180, 19600, 20825, 22100, 27720, 29260, 30856, 41664, 43680, 45760, 54740, 70300, 73150, 76076, 88560, 102340, 105995, 109736, 125580, 129766, 134044, 138415, 142880, 161700
(list; graph; listen)
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OFFSET
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1,1
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MAPLE
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tet := proc(n) n*(n+1)*(n+2)/6 ; end: for n from 1 to 300 do if not isprime(n) and not isprime(n+1) and not isprime(n+2) then printf("%d, ", tet(n)) ; fi; od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 10 2008]
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CROSSREFS
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Cf. A000292, A141468, A144291.
Sequence in context: A157960 A067915 A115619 this_sequence A100145 A090216 A113546
Adjacent sequences: A152619 A152620 A152621 this_sequence A152623 A152624 A152625
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Dec 10 2008
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EXTENSIONS
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20400 replaced by 19600, 20625 replaced by 20825, R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 10 2008
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