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 A067006 Smallest number for which the totient is divisible by the n-th nontotient number, that is, the n-th term of A007617. 0
 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; text; internal format)
 OFFSET 1,1 LINKS FORMULA a(n) = min_{x : mod(x, A007617(n)) = 0}. For all nontotient numbers x, q*x+1 is prime with large enough q and a divisor of phi(q*x+1) = q*x is x, the selected nontotient number. 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. CROSSREFS Cf. A000010, A007617, A066674-A066678, A067005. Sequence in context: A002810 A045736 A158807 * A136020 A076304 A122560 Adjacent sequences:  A067003 A067004 A067005 * A067007 A067008 A067009 KEYWORD nonn AUTHOR Labos Elemer, Dec 22 2001 STATUS approved

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Last modified January 17 23:37 EST 2020. Contains 330995 sequences. (Running on oeis4.)