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Search: id:A074390
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| 1, 6, 18, 12, 200, 42, 196, 56, 459, 950, 5203, 396, 9243, 980, 1800, 336, 19363, 270, 13357, 600, 1764, 10406, 72473, 168, 18625, 34814, 4293, 812, 145493, 1350, 15376, 992, 19602, 38726, 41615, 1836, 99937, 26714, 1521, 440, 274003, 3822, 475193
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OFFSET
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1,2
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FORMULA
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a(n)=Min{x; GCD[x, sigma(x), Phi(x)]}= Min{x; GCD[A000005(x), A000010(x), x]}=n
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EXAMPLE
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n=79: a(79)=979837 because GCD[979837,998718,961272]=79 and a(79) is the smallest.
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MATHEMATICA
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f[x_] := GCD[DivisorSigma[1, x], EulerPhi[x], x] t=Table[0, {100}]; Do[s=f[n]; If[s<101&&t[[s]]==0, t[[s]]=n], {n, 1, 1000000}];
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CROSSREFS
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Cf. A000005, A000010, A073815, A050399, A009195, A009194.
Sequence in context: A129870 A091014 A097370 this_sequence A045857 A074791 A093106
Adjacent sequences: A074387 A074388 A074389 this_sequence A074391 A074392 A074393
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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), Aug 23 2002
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