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A134603
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Numbers (excluding primes and powers of primes) such that the square mean of their prime factors is an integer (where the square mean of c and d is sqrt((c^2+d^2)/2)).
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1
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119, 161, 351, 378, 455, 527, 595, 721, 845, 918, 959, 1045, 1081, 1241, 1265, 1323, 1375, 1547, 1615, 1792, 1855, 2047, 2145, 2175, 2345, 2457, 2645, 2665, 2737, 3281, 3367, 3509, 3713, 3835, 3887, 3995, 4207, 4305, 4347, 4625, 4633, 4655, 4681, 5000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Numbers included in A134600, but not in A025475. a(0)=119 is the minimal number with this property.
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EXAMPLE
| a(1)=161, since 161=7*23 and sqrt((7^2+23^2)/2)=sqrt(289)=17.
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CROSSREFS
| Cf. A001597, A025475, A134333, A134344, A134376.
Cf. A134600, A134605, A134608, A134611, A134617, A134619, A134621.
Sequence in context: A046007 A135716 A026049 * A134604 A207059 A063348
Adjacent sequences: A134600 A134601 A134602 * A134604 A134605 A134606
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KEYWORD
| nonn
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AUTHOR
| Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Nov 11 2007
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