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Search: id:A138593
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| A138593 |
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Sums of 5 or more consecutive integers. |
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+0
1
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| 10, 15, 20, 21, 25, 27, 28, 30, 33, 35, 36, 39, 40, 42, 44, 45, 49, 50, 51, 52, 54, 55, 56, 57, 60, 63, 65, 66, 68, 69, 70
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also: the numbers of the form s*k+A000217(k-1), s>=0, k>=5. Changing the lower limit to k from 5 to 2, 4 or 6 also defines A138591, A138592 and A138594. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 31 2008]
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EXAMPLE
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0+1+2=3+4=10, 1+2+3+4+5=15, 2+3+4+5+6=20, 1+2+3+4+5+6=21,...
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MATHEMATICA
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Array[r, 9]; k=0; For[i=0, i<=55, a=i*4+6; For[j=i+4, j<=66, a=a+j; k++; r[k]=a; j++ ]; i++ ]; q=Union[Array[r, k]]; StringTake[ToString[q], 123]
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CROSSREFS
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Sequence in context: A139540 A135363 A118717 this_sequence A004259 A006623 A035166
Adjacent sequences: A138590 A138591 A138592 this_sequence A138594 A138595 A138596
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), May 13 2008
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