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Search: id:A038550
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| A038550 |
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Products of an odd prime and a power of two (sorted). |
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+0
3
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| 3, 5, 6, 7, 10, 11, 12, 13, 14, 17, 19, 20, 22, 23, 24, 26, 28, 29, 31, 34, 37, 38, 40, 41, 43, 44, 46, 47, 48, 52, 53, 56, 58, 59, 61, 62, 67, 68, 71, 73, 74, 76, 79, 80, 82, 83, 86, 88, 89, 92, 94, 96, 97, 101, 103, 104, 106, 107, 109, 112, 113, 116, 118, 122, 124, 127
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also, numbers that can be expressed as the sum of k>1 consecutive integers in only one way. The numbers have the form sum{i=j..j+k-1}{i}, with j and k integers. - Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Aug 21 2007. For example, 37 = 18+19; 48 = 15+16+17; 56 = 5+6+7+8+9+10+11.
Numbers that are difference of two triangular numbers in exactly two ways
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
T. Verhoeff, Rectangular and Trapezoidal Arrangements, J. Integer Sequences, Vol. 2, 1999, #99.1.6.
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CROSSREFS
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Sequence in context: A055597 A053048 A028983 this_sequence A028730 A028747 A136806
Adjacent sequences: A038547 A038548 A038549 this_sequence A038551 A038552 A038553
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KEYWORD
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nonn,easy,nice
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AUTHOR
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Tom Verhoeff (Tom.Verhoeff(AT)acm.org)
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EXTENSIONS
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Edited by njas at the suggestion of Zak Seidov, Sep 15 2007
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