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Search: id:A117473
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| A117473 |
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The values of 'a' in a^2 + b^2 = c^2, where b - a = 17, and gcd(a,b,c)=1. |
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+0
2
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| 7, 28, 88, 207, 555, 1248, 3276, 7315, 19135, 42676, 111568, 248775, 650307, 1450008, 3790308, 8451307, 22091575, 49257868, 128759176, 287095935, 750463515, 1673317776, 4374021948, 9752810755, 25493668207
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OFFSET
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1,1
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COMMENT
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b - a = 17 is the third term in A058529
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FORMULA
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a(1)=7, a(2)=28, a(3)=207, a(4)=555, a(n)=6*a(n-2) - a(n-4) + 34
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EXAMPLE
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a(5) = 6*88 - 7 + 34 = 555, and 555^2 + 572^2 = 797^2, and 572-555=17, and gcd(555, 572, 797) = 1
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CROSSREFS
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Cf. A058529, A117472.
Sequence in context: A000579 A049017 A054469 this_sequence A022572 A024207 A000416
Adjacent sequences: A117470 A117471 A117472 this_sequence A117474 A117475 A117476
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KEYWORD
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nonn
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AUTHOR
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Andras Erszegi (erszegi.andras(AT)chello.hu), Mar 19 2006
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