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Search: id:A080364
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| A080364 |
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n is such that its least prime divisor is also one of its unitary prime divisors and n is not a prime number. |
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+0
3
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| 6, 10, 14, 15, 18, 21, 22, 26, 30, 33, 34, 35, 38, 39, 42, 46, 50, 51, 54, 55, 57, 58, 62, 65, 66, 69, 70, 74, 75, 77, 78, 82, 85, 86, 87, 90, 91, 93, 94, 95, 98, 102, 105, 106, 110, 111, 114, 115, 118, 119, 122, 123, 126, 129, 130, 133, 134, 138, 141, 142, 143, 145, 146
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OFFSET
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1,1
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EXAMPLE
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n=50: it is not a prime, 50=2.5.5, least prime factor is 2 and GCD[2,50/2]=1 so 2 is unitary-prime-divisor of 50, thus 50 is here.
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MATHEMATICA
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mi[x_] := Part[Flatten[FactorInteger[x]], 1] k=0; Do[s=mi[n]; If[Equal[GCD[s, n/s], 1]&&!PrimeQ[n], Print[n]], {n, 2, 256}]
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CROSSREFS
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Cf. A034444, A056169, A020639, A080363.
Adjacent sequences: A080361 A080362 A080363 this_sequence A080365 A080366 A080367
Sequence in context: A143907 A132982 A069169 this_sequence A082092 A069116 A063763
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Feb 21 2003
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