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Search: id:A081491
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| A081491 |
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Triangle read by rows in which the n-th row contains n terms of an arithmetic progression with a common difference of (n-1) and the first term of (n+1)-th row is 1 more than the last term of the n-th row. |
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4
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| 1, 2, 3, 4, 6, 8, 9, 12, 15, 18, 19, 23, 27, 31, 35, 36, 41, 46, 51, 56, 61, 62, 68, 74, 80, 86, 92, 98, 99, 106, 113, 120, 127, 134, 141, 148, 149, 157, 165, 173, 181, 189, 197, 205, 213, 214, 223, 232, 241, 250, 259, 268, 277, 286, 295, 296, 306, 316, 326, 336, 346
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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1; 2,3; 4,6,8; 9,12,15,18; 19,23,27,31,35; 36,41,46,51,56,61; ...
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CROSSREFS
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Cf. A002522, A005408, A081489, A081490, A081492.
Adjacent sequences: A081488 A081489 A081490 this_sequence A081492 A081493 A081494
Sequence in context: A006446 A002348 A019469 this_sequence A161826 A048716 A010434
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2003
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EXTENSIONS
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More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 29 2003
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