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Search: id:A154614
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| A154614 |
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Triangle read by rows where T(m,n)=mn+m+n-1 |
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+0
2
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| 2, 4, 7, 6, 10, 14, 8, 13, 18, 23, 10, 16, 22, 28, 34, 12, 19, 26, 33, 40, 47, 14, 22, 30, 38, 46, 54, 62, 16, 25, 34, 43, 52, 61, 70, 79, 18, 28, 38, 48, 58, 68, 7, 88, 98, 20, 31, 42, 53, 64, 75, 86, 97, 108, 119
(list; table; graph; listen)
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OFFSET
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1,1
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COMMENT
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Numbers n such that n+2 is not prime. If m=n then a(n)=m^2+2m-1=(2, 7, 14, 23, 34, 47,...)and a(n)+2 is a square
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EXAMPLE
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Triangle begins: 2; 4, 7; 6, 10, 14; 8, 13, 18, 23; 10, 16, 22, 28, 34; 12, 19, 26, 33, 40, 47; 14, 22, 30, 38, 46, 54, 62; 16, 25, 34, 43, 52, 61, 70, 79; 18, 28, 38, 48, 58, 68, 78, 88, 98; 20, 31, 42, 53, 64, 75, 86, 97, 108, 119;
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CROSSREFS
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Cf. A040976
Sequence in context: A035311 A129980 A126786 this_sequence A161211 A161368 A023978
Adjacent sequences: A154611 A154612 A154613 this_sequence A154615 A154616 A154617
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KEYWORD
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nonn,tabf,tabl
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 16 2009
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