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 A015126 Least k such that phi(k) = phi(n). 7
 1, 1, 3, 3, 5, 3, 7, 5, 7, 5, 11, 5, 13, 7, 15, 15, 17, 7, 19, 15, 13, 11, 23, 15, 25, 13, 19, 13, 29, 15, 31, 17, 25, 17, 35, 13, 37, 19, 35, 17, 41, 13, 43, 25, 35, 23, 47, 17, 43, 25, 51, 35, 53, 19, 41, 35, 37, 29, 59, 17, 61, 31, 37, 51, 65, 25, 67, 51, 69, 35, 71, 35, 73 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Antti Karttunen, Table of n, a(n) for n = 1..10000 PROG (PARI) a(n) = {my(en = eulerphi(n)); k = 1; while (eulerphi(k) != en, k++); return (k); } \\ Michel Marcus, Jun 17 2013 CROSSREFS Cf. A000010, A028476, A066412, A066659. Sequence in context: A114003 A219792 A029622 * A219793 A215495 A335115 Adjacent sequences:  A015123 A015124 A015125 * A015127 A015128 A015129 KEYWORD nonn,look AUTHOR Vladeta Jovovic, Jan 12 2002 STATUS approved

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Last modified June 14 12:04 EDT 2021. Contains 345025 sequences. (Running on oeis4.)