| 5, 10, 13, 15, 17, 20, 25, 26, 29, 30, 34, 35, 37, 39, 40, 41, 45, 50, 51, 52, 53, 55, 58, 60, 61, 65, 68, 70, 73, 74, 75, 78, 80, 82, 85, 87, 89, 90, 91, 95, 97, 100, 101, 102, 104, 105, 106, 109, 110, 111, 113, 115, 116, 117, 119, 120, 122, 123, 125, 130, 135, 136, 137, 140
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Multiples of Pythagorean primes A002144 or of primitive Pythagorean triangles' hypotenuses A008846. - Lekraj Beedassy (blekraj(AT)yahoo.com), Nov 12 2003
It appears that this is exactly the sequence of positive integers with at least one prime divisor of the form 4k+1. (This has been verified for all terms<=500.) Compare A072592. - John W. Layman (layman(AT)math.vt.edu), Mar 12 2008
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REFERENCES
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S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 98-104.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
S. R. Finch, Landau-Ramanujan Constant
Ron Knott, Pythagorean Triples and Online Calculators
Index entries for sequences related to sums of squares
R. Chapman, Pythagorean triples and sums of squares
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CROSSREFS
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Cf. A009000, A009003, A024507, A004431. Complement of A004144.
Primitive elements give A002144.
Cf. A072592.
Sequence in context: A049197 A009000 A057100 this_sequence A071821 A084645 A092604
Adjacent sequences: A009000 A009001 A009002 this_sequence A009004 A009005 A009006
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net)
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