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Search: id:A139546
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| A139546 |
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Numbers of form x^2+5y^2 (x>=0,y>=0) with repetition. |
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+0
1
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| 0, 1, 4, 5, 6, 9, 9, 14, 16, 20, 21, 21, 24, 25, 29, 30, 36, 36, 41, 45, 45, 46, 49, 49, 54, 54, 56, 61, 64, 69, 69, 70, 80, 81, 81, 81, 84, 84, 86, 89, 94, 96, 100, 101, 105, 105, 109, 116, 120, 121, 125, 126, 126, 126, 129, 129, 134, 141, 141, 144, 144, 145, 149, 150
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OFFSET
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0,3
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COMMENT
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There are no repeated primes of this form (A033205).
D. Cox, "Primes of Form x^2 + n y^2", Wiley, 1989.
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EXAMPLE
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0=0^2+5*0^2,
9=2^2+5*1^2=3^2+5*0^2,
81=1^2+5*4^2=6^2+5*3^2=9^2+5*0^2,
441: {x,y}={6,9},{11,8},{14,7},{19,4},{21,0}.
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CROSSREFS
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Cf. A033205.
Sequence in context: A086726 A078885 A049466 this_sequence A029776 A114454 A008854
Adjacent sequences: A139543 A139544 A139545 this_sequence A139547 A139548 A139549
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Apr 26 2008
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