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A049051
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Numbers k such that k through k+4 all have the same number of divisors.
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13
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11605, 12855, 13782, 19142, 21494, 28374, 28375, 40311, 42805, 50582, 55254, 60231, 60663, 79094, 87655, 90181, 90182, 95845, 99655, 103621, 109765, 115591, 120727, 121045, 122151, 122871, 142454, 142806, 152630, 157493, 157494, 171893
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Flatten[Position[Partition[DivisorSigma[0, Range[200000]], 5, 1], _?(Length[ Union[#]] == 1&), {1}, Heads->False]] (* Harvey P. Dale, May 30 2014 *)
SequencePosition[DivisorSigma[0, Range[200000]], {x_, x_, x_, x_, x_}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 03 2017 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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