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Search: id:A155576
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| A155576 |
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Intersection of A000404 and A155716: N = a^2 + b^2 = c^2 + 6d^2 for some positive integers a,b,c,d. |
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+0
2
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| 10, 25, 40, 58, 73, 90, 97, 100, 106, 145, 160, 193, 202, 225, 232, 241, 250, 265, 292, 298, 313, 337, 346, 360, 388, 394, 400, 409, 424, 433, 457, 490, 505, 522, 538, 577, 580, 586, 601, 625, 634, 640, 657, 673, 730, 745, 769, 772, 778, 808, 810, 841, 865
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Subsequence of A155566 (where a,b,c,d may be zero).
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PROGRAM
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(PARI) isA155576(n, /* optional 2nd arg allows us to get other sequences */c=[6, 1]) = { for(i=1, #c, for(b=1, sqrtint((n-1)\c[i]), issquare(n-c[i]*b^2) & next(2)); return); 1}
for( n=1, 999, isA155576(n) & print1(n", "))
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CROSSREFS
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Cf. A000404, A154777, A092572, A097268, A154778, A155716, ...
Sequence in context: A038350 A003344 A047721 this_sequence A043123 A043903 A163631
Adjacent sequences: A155573 A155574 A155575 this_sequence A155577 A155578 A155579
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KEYWORD
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easy,nonn
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AUTHOR
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M. F. Hasler (MHasler(AT)univ-ag.fr), Jan 25 2009
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