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A362185
Numbers k with a single solution x to the equation A323410(x) = k.
4
0, 4, 7, 9, 11, 216, 218, 220, 546, 652, 666, 700, 834, 850, 906, 924, 996, 1242, 1386, 1476, 1506, 1516, 1596, 1646, 1662, 1758, 1770, 1858, 1890, 1900, 1946, 2046, 2170, 2262, 2352, 2422, 2578, 2626, 2668, 2682, 2814, 2842, 2980, 2992, 3010, 3048, 3100, 3154
OFFSET
1,2
COMMENTS
Numbers k such that A362181(k) = 1.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..2335 (terms below 10^5)
EXAMPLE
0 is a term since there is only one solution, x = 1, to A323410(x) = 0.
MATHEMATICA
ucototient[n_] := n - Times @@ (Power @@@ FactorInteger[n] - 1); ucototient[1] = 0; With[{max = 300}, solnum = Table[0, {n, 1, max}]; Do[If[(i = ucototient[k]) <= max, solnum[[i]]++], {k, 2, max^2}]; Join[{0}, Position[solnum, 1] // Flatten]]
CROSSREFS
The unitary version of A131825.
Similar sequence: A361969.
Sequence in context: A310950 A256823 A074341 * A085922 A048973 A092861
KEYWORD
nonn
AUTHOR
Amiram Eldar, Apr 10 2023
STATUS
approved