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Search: id:A105040
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| A105040 |
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Nonnegative n such that 7*n^2 + 7*n + 1 is a square. |
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+0
7
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OFFSET
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0,2
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COMMENT
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3936 = 254*15 + 111 + 15, 28320 = 254*111 + 111 + 15, 999855 = 254*3936 + 111, 7193295 = 254*28320 + 15.
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PROGRAM
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(PARI) for(n=0, 7193295, if(issquare(7*n*(n+1)+1), print1(n, ", ")))
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CROSSREFS
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Sequence in context: A054367 A034184 A092646 this_sequence A105051 A110822 A001849
Adjacent sequences: A105037 A105038 A105039 this_sequence A105041 A105042 A105043
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KEYWORD
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nonn
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AUTHOR
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Gerald McGarvey (Gerald.McGarvey(AT)comcast.net), Apr 03 2005
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