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Search: id:A155724
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| A155724 |
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Triangle read by rows where T(m,n)=2mn+m+n-4 |
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+0
4
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| 0, 3, 8, 6, 13, 20, 9, 18, 27, 36, 12, 23, 34, 45, 56, 15, 28, 41, 54, 67, 80, 18, 33, 48, 63, 78, 93, 108, 21, 38, 55, 72, 89, 106, 123, 140, 24, 43, 62, 81, 100, 119, 138, 157, 176, 27, 48, 69, 90, 111, 132, 153, 174, 195, 216
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Numbers n such that 2n+9 is not prime
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EXAMPLE
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Triangle begins: 0; 3, 8; 6, 13, 20; 9, 18, 27, 36; 12, 23, 34, 45, 56; 15, 28, 41, 54, 67, 80; 18, 33, 48, 63, 78, 93, 108; 21, 38, 55, 72, 89, 106, 123, 140; 24, 43, 62, 81, 100, 119, 138, 157, 176; 27, 48, 69, 90, 111, 132, 153, 174, 195, 216;
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CROSSREFS
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Cf. A155723, A155722
Sequence in context: A083700 A021725 A080939 this_sequence A098737 A164654 A072396
Adjacent sequences: A155721 A155722 A155723 this_sequence A155725 A155726 A155727
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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 25 2009
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