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Search: id:A011916
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| A011916 |
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((b(n)-1)+Sqrt(3*b(n)^2-4*b(n)+1))/2, where b(n) is A011922. |
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4
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| 3, 44, 615, 8568, 119339, 1662180, 23151183, 322454384, 62554488348
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Integers n such that n^2 = sum(n+1,n+2,n+3,...,n+x) for some value of x. 3 is a term because 3^2=9 and 4+5=9; 44 is a term because 44^2=1936 and the sum of (45,46,47,...,76) = 1936. [From Gil Broussard (gilbroussard(AT)bellsouth.net), Dec 23 2008]
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REFERENCES
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Mario VELUCCHI "Seeing couples" in Recreational and Educational Computing, to appear 1997.
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CROSSREFS
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Sequence in context: A055539 A046946 A092545 this_sequence A102811 A142600 A103980
Adjacent sequences: A011913 A011914 A011915 this_sequence A011917 A011918 A011919
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KEYWORD
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nonn,easy
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AUTHOR
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Mario Velucchi (mathchess(AT)velucchi.it)
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