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A155572
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Intersection of A000404, A154777 and A154778: N = a^2 + b^2 = c^2 + 2d^2 = e^2 + 5f^2 for some positive integers a,b,c,d,e,f.
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0
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41, 89, 164, 225, 241, 281, 356, 369, 401, 409, 449, 521, 569, 601, 641, 656, 761, 769, 801, 809, 881, 900, 929, 964, 1009, 1025, 1049, 1124, 1129, 1201, 1249, 1289, 1321, 1361, 1409, 1424, 1476, 1481, 1489, 1521, 1601, 1604, 1609, 1636, 1681, 1721, 1796
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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PROG
| (PARI) isA155572(n, /* optional 2nd arg allows us to get other sequences */c=[5, 2, 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, 1999, isA155572(n) & print1(n", "))
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CROSSREFS
| Cf. A000404, A154777, A092572, A097268, A154778, A155716, A155717, A155560-A155578.
Sequence in context: A188173 A142411 A139924 * A107145 A087857 A139995
Adjacent sequences: A155569 A155570 A155571 * A155573 A155574 A155575
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KEYWORD
| easy,nonn
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AUTHOR
| M. F. Hasler (www.univ-ag.fr/~mhasler), Jan 25 2009
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