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Search: id:A154684
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| A154684 |
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Triangle read by rows where T(m,n)=2mn+m+n-3 |
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+0
2
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| 1, 4, 9, 7, 14, 21, 10, 19, 28, 37, 13, 24, 35, 46, 57, 16, 29, 42, 55, 68, 81, 19, 34, 49, 64, 79, 94, 109, 22, 39, 56, 73, 90, 107, 124, 141, 25, 44, 63, 82, 101, 120, 139, 158, 177, 28, 49, 70, 91, 112, 133, 154, 175, 196, 217
(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+7 is not prime
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EXAMPLE
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Triangle begins: 1; 4, 9; 7, 14, 21; 10, 19, 28, 37; 13, 24, 35, 46, 57; 16, 29, 42, 55, 68, 81; 19, 34, 49, 64, 79, 94, 109; 22, 39, 56, 73, 90, 107, 124, 141; 25, 44, 63, 82, 101, 120, 139, 158, 177; 28, 49, 70, 91, 112, 133, 154, 175, 196, 217;
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CROSSREFS
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Cf. A153053, A105760
Sequence in context: A092554 A155787 A123157 this_sequence A096982 A159643 A145424
Adjacent sequences: A154681 A154682 A154683 this_sequence A154685 A154686 A154687
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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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