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A134602
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Numbers such that the square mean of their prime factors is a nonprime integer (where the square mean of c and d is sqrt((c^2+d^2)/2)).
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18
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378, 455, 527, 918, 1265, 1615, 2047, 2145, 2175, 2345, 2665, 3713, 3835, 4207, 4305, 4633, 5000, 5117, 5382, 6061, 6678, 6887, 6965, 7055, 7267, 7327, 7497, 7685, 7791, 8470, 8785, 8918, 9641, 10205, 10545, 10647, 11137, 11543, 11713, 13482, 14079
(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 A134601. a(0)=378 is the minimal number with this property.
Also numbers included in A134603, but not in A134604.
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EXAMPLE
| a(1)=455, since 455=5*7*13 and sqrt((5^2+7^2+13^2)/3)=sqrt(81)=9.
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CROSSREFS
| Cf. A001597, A025475, A134333, A134344, A134376.
Cf. A134600, A134604, A134608, A134611, A134617, A134619, A134621.
Sequence in context: A003918 A045197 A098835 * A030029 A064242 A116339
Adjacent sequences: A134599 A134600 A134601 * A134603 A134604 A134605
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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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