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Search: id:A081375
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| 1, 2, 6, 12, 30, 42, 72, 78, 84, 90, 190, 216, 222, 228, 234, 252, 270, 540, 546, 570, 630, 738, 744, 770, 792, 858, 900, 924, 930, 990, 1050, 1638, 1710, 1890, 1980, 2100, 2310, 2418, 2442, 2508, 2562, 2574, 2604, 2700, 2772, 2790, 2850, 2970, 3150
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OFFSET
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1,2
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MATHEMATICA
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f[x_] := Count[Table[EulerPhi[j]-EulerPhi[x], {j, 1, x}], 0] t=Table[0, {50}]; Do[s=f[n]; If[s<51&&t[[s]]==0, t[[s]]=n], {n, 1, 4000}]; t
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CROSSREFS
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Cf. A081373, A081374, A000010, A067004, A008479.
Sequence in context: A094779 A093387 A143176 this_sequence A024701 A038199 A056267
Adjacent sequences: A081372 A081373 A081374 this_sequence A081376 A081377 A081378
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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), Mar 24 2003
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