cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A362182 Unitary noncototient numbers: numbers k such that A323410(x) = k has no solution.

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%I A362182 #9 Apr 11 2023 04:18:08
%S A362182 2,3,5,330,1206,1210,1656,1718,1806,1866,1926,2376,2982,3162,3186,
%T A362182 3342,4012,4062,4194,4326,4502,4662,4810,5322,5466,6172,6402,6462,
%U A362182 6534,6546,6672,6756,7266,7430,7866,8030,8140,8286,8386,8562,8586,8860,9114,9370,9516,9906
%N A362182 Unitary noncototient numbers: numbers k such that A323410(x) = k has no solution.
%C A362182 Numbers k such that A362181(k) = 0.
%C A362182 Are 3 and 5 the only odd terms? There are no other odd terms below 10^5.
%H A362182 Amiram Eldar, <a href="/A362182/b362182.txt">Table of n, a(n) for n = 1..534</a> (terms below 10^5)
%t A362182 ucototient[n_] := n - Times @@ (Power @@@ FactorInteger[n] - 1); ucototient[1] = 0; With[{max = 2000}, Complement[Range[max], Table[ucototient[n], {n, 1, max^2}]]]
%Y A362182 Cf. A323410, A362181.
%Y A362182 The unitary version of A005278.
%Y A362182 Similar sequences: A007617, A347771.
%K A362182 nonn
%O A362182 1,1
%A A362182 _Amiram Eldar_, Apr 10 2023