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Search: id:A154685
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| A154685 |
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Triangle read by rows where T(m,n)=2mn+m+n+4 |
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+0
8
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| 8, 11, 16, 14, 21, 28, 17, 26, 35, 44, 20, 31, 42, 53, 64, 23, 36, 49, 62, 75, 88, 26, 41, 56, 71, 86, 101, 116, 29, 46, 63, 80, 97, 114, 131, 148, 32, 51, 70, 89, 108, 127, 146, 165, 184, 35, 56, 77, 98, 119, 140, 161, 182, 203, 224
(list; table; graph; listen)
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OFFSET
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1,1
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COMMENT
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The terms form a subset of A153039 because 2*T(m,n)-7=(2n+1)(2m+1) are not prime.
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EXAMPLE
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Triangle begins:
8;
11, 16;
14, 21, 28;
17, 26, 35, 44;
20, 31, 42, 53, 64;
23, 36, 49, 62, 75, 88;
26, 41, 56, 71, 86, 101, 116;
29, 46, 63, 80, 97, 114, 131, 148;
32, 51, 70, 89, 108, 127, 146, 165, 184;
35, 56, 77, 98, 119, 140, 161, 182, 203, 224;
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CROSSREFS
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Cf. A153039, A089192
Row sums: A151675. - N. J. A. Sloane, May 31 2009
Sequence in context: A032423 A063724 A167499 this_sequence A068591 A065348 A155717
Adjacent sequences: A154682 A154683 A154684 this_sequence A154686 A154687 A154688
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KEYWORD
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nonn,tabl
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 18 2009
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EXTENSIONS
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Clarified comment. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 24 2009
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