A352710 Least k such that A352483(k) = 2*n-1, or -1 if no such k exists.
3, 5, 7, 20, 11, 13, 32, 17, 19, 44, 23, 27, 216, 29, 31, 35, 280, 37, 117, 41, 43, 92, 47, 51, 153, 53, 57, 116, 59, 61, 65, 520, 67, 207, 71, 73, 77, 616, 79, 164, 83, 87, 261, 89, 93, 95, 760, 97, 105, 101, 103, 212, 107, 109, 333, 113, 920, 119, 952, 123, 125, 1000, 127, 135, 131
Offset: 1
Keywords
Links
- Michel Marcus, Table of n, a(n) for n = 1..10000
Programs
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PARI
f(n) = my(d=numdiv(n)); denominator(n*d/(n-d)); \\ A352483 a(n) = {my(k=3, q=2*n-1); while (f(k) != q, k++); k; }
Formula
a(n) = A351913(2*n-1).