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A067006
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Smallest number for which the totient is divisible by the n-th non-totient number, i.e. n-th term of A007617.
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0
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7, 11, 29, 19, 23, 53, 29, 31, 103, 191, 43, 47, 101, 53, 81, 59, 311, 67, 103, 71, 149, 191, 79, 83, 173, 181, 283, 197, 101, 103, 107, 121, 229, 709, 367, 311, 127, 131, 269, 137, 139, 569, 293, 149, 151, 229, 463, 317, 163, 167, 1021, 173, 349, 179, 181, 547
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| a(n)=Min{x : Mod[x, A007617(n)]=0}. For all non-totient numbers x, qx+1 is prime with large enough q and a divisor of Phi[qx+1]=qx is x, the selected non-totient number.
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EXAMPLE
| 14=A007617(7) is not totient of any other number, but Phi[29]=28 is divisible with 14 and 29 is the smallest number of which the totient is a multiple of 14, so a(7)=29.
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CROSSREFS
| Cf. A000010, A007617, A066674-A066678, A067005.
Sequence in context: A002810 A045736 A158807 * A136020 A076304 A122560
Adjacent sequences: A067003 A067004 A067005 * A067007 A067008 A067009
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Dec 22 2001
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