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Search: id:A104023
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| A104023 |
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Number n which have more than one way of being written as k^2*j, 0 < j <= k & (k, j) = 1. |
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+0
5
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| 100, 196, 324, 484, 676, 900, 1089, 1156, 1444, 1521, 1764, 2028, 2116, 2304, 2500, 2601, 2916, 3249, 3364, 3468, 3600, 3844, 4332, 4356, 4624, 4761, 4900, 5476, 5625, 5776, 6084, 6348, 6498, 6724, 7056, 7396, 7500, 7569, 8100, 8464, 8649, 8820, 8836
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OFFSET
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1,1
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MATHEMATICA
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t = Sort[ Flatten[ Table[ If[ GCD[k, j] == 1, k^2*j, {}], {k, 1000}, {j, k}]]]; u = Table[ Count[t, n], {n, 9215}]; Select[ Range[9215], u[[ # ]] > 1 &]
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CROSSREFS
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Cf. A104022, A102448, A104021.
Adjacent sequences: A104020 A104021 A104022 this_sequence A104024 A104025 A104026
Sequence in context: A025411 A025408 A068805 this_sequence A072367 A036742 A044332
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com) and Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 24 2005
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