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 A043343 Numbers n such that there is no k > n such that phi(k) = phi(n), where phi is Euler's totient function. 5
 2, 6, 12, 18, 22, 30, 42, 46, 54, 58, 60, 62, 66, 90, 94, 98, 106, 118, 120, 126, 134, 138, 142, 150, 158, 162, 166, 174, 198, 206, 210, 214, 240, 242, 250, 254, 262, 270, 274, 276, 278, 282, 294, 298, 302, 318, 330, 334, 346, 348, 354, 358, 378, 382, 394, 398 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Paul Tek, Table of n, a(n) for n = 1..980 FORMULA A066659(a(n)) = 0. A028476(a(n)) = a(n). MATHEMATICA Flatten@ Position[#, 0] &@ Table[k = n + 1; While[And[k <= 2 n + 1, EulerPhi@ k != EulerPhi@ n], k++]; Boole[k < 2 n + 1] k, {n, 400}] (* Michael De Vlieger, Dec 31 2016 *) CROSSREFS Cf. A066659. Sequence in context: A263269 A262503 A263082 * A066080 A319270 A071707 Adjacent sequences: A043340 A043341 A043342 * A043344 A043345 A043346 KEYWORD nonn AUTHOR Vladeta Jovovic, Jan 12 2002 EXTENSIONS Offset corrected by Paul Tek, Sep 25 2015 Definition clarified by Alonso del Arte, Dec 31 2016 STATUS approved

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Last modified August 8 07:31 EDT 2024. Contains 375020 sequences. (Running on oeis4.)