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Search: id:A081493
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| A081493 |
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Triangle read by rows in which the n-th row begins with n and contains n terms of an Arithmetic progression with a common difference of (n-1). |
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+0
1
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| 1, 2, 3, 3, 5, 7, 4, 7, 10, 13, 5, 9, 13, 17, 21, 6, 11, 16, 21, 26, 31, 7, 13, 19, 25, 31, 37, 43, 8, 15, 22, 29, 36, 43, 50, 57, 9, 17, 25, 33, 41, 49, 57, 65, 73, 10, 19, 28, 37, 46, 55, 64, 73, 82, 91, 11, 21, 31, 41, 51, 61, 71, 81, 91, 101, 111, 12, 23, 34, 45, 56, 67, 78, 89
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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n-th row sum gives the sum corresponding to the magic square of order n.
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FORMULA
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T(i, j) = i+(i-1)*(j-1) - David Wasserman (wasserma(AT)spawar.navy.mil), Jun 03 2004
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EXAMPLE
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1; 2,3; 3,5,7; 4,7,10,13; 5,9,13,17,21; 6,11,16,21,26,31; ...
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CROSSREFS
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Sequence in context: A121400 A056878 A092557 this_sequence A077558 A122444 A066072
Adjacent sequences: A081490 A081491 A081492 this_sequence A081494 A081495 A081496
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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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Corrected and extended by David Wasserman (wasserma(AT)spawar.navy.mil), Jun 03 2004
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