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Search: id:A163674
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| A163674 |
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Triangle T(n,m) = 2*m*n+m+n+9 read by rows. |
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+0
3
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| 13, 16, 21, 19, 26, 33, 22, 31, 40, 49, 25, 36, 47, 58, 69, 28, 41, 54, 67, 80, 93, 31, 46, 61, 76, 91, 106, 121, 34, 51, 68, 85, 102, 119, 136, 153, 37, 56, 75, 94, 113, 132, 151, 170, 189, 40, 61, 82, 103, 124, 145, 166, 187, 208, 229, 43, 66, 89, 112, 135, 158, 181
(list; table; graph; listen)
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OFFSET
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1,1
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COMMENT
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If p= 2*n+1 is a prime number, then T(n,n)=(p^2+17)/2.
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FORMULA
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T(n,m)=A163657(n,m)+1.
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EXAMPLE
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Triangle begins:
13;
16, 21;
19, 26, 33;
22, 31, 40, 49;
25, 36, 47, 58, 69;
28, 41, 54, 67, 80, 93;
31, 46, 61, 76, 91, 106, 121;
34, 51, 68, 85, 102, 119, 136, 153;
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CROSSREFS
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Cf. A153051
Sequence in context: A064805 A159975 A110623 this_sequence A132947 A056663 A103230
Adjacent sequences: A163671 A163672 A163673 this_sequence A163675 A163676 A163677
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KEYWORD
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nonn,easy,tabl
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 03 2009
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 12 2009
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