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Search: id:A134604
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| A134604 |
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Numbers (excluding primes and powers of primes) such that the square mean of their prime factors is a prime (where the square mean of c and d is sqrt((c^2+d^2)/2)). |
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+0
2
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| 119, 161, 351, 595, 721, 845, 959, 1045, 1081, 1241, 1323, 1375, 1547, 1792, 1855, 2457, 2645, 2737, 3281, 3367, 3509, 3887, 3995, 4347, 4625, 4655, 4681, 5376, 5795, 6545, 6615, 6643, 6993, 7505, 7705, 7803, 7889, 8019, 9295, 9625, 10557, 11845
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OFFSET
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1,1
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COMMENT
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Numbers included in A134601, but not in A025475. a(0)=119 is the minimal number with this property.
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EXAMPLE
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a(1)=161, since 161=7*23 and sqrt((7^2+23^2)/2)=sqrt(289)=17.
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CROSSREFS
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Cf. A001597, A025475, A134333, A134344, A134376.
Cf. A134600, A134602, A134608, A134611, A134617, A134619, A134621.
Sequence in context: A135716 A026049 A134603 this_sequence A063348 A103852 A157040
Adjacent sequences: A134601 A134602 A134603 this_sequence A134605 A134606 A134607
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KEYWORD
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nonn
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AUTHOR
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Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Nov 11 2007
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