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A046465
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Numbers k such that the concatenation of numbers from 1 to k is the product of 6 primes (not necessarily distinct).
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1
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11, 12, 18, 19, 22, 24, 32, 33, 39, 49, 57, 65, 70, 71, 75, 76, 78, 79, 81, 83, 85, 87, 88, 91, 95, 96, 99, 105, 110
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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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Select[Range[100], PrimeOmega@FromDigits@Flatten@IntegerDigits@Range@# == 6 &] (* Robert Price, Oct 11 2019 *)
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CROSSREFS
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KEYWORD
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nonn,base,hard,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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