OFFSET
1,7
COMMENTS
Least k such that A280801(k) = n, or 0 if no such k exists are 1, 7, 19, 17, 31, 223, 61, 79, 151, 383, 181, 347, 523, 1109, 43, 607, 101, 733, 1033, 409, 1783, 1123, 199, 1471, 1301, 5113, 1801, 2311, 3617, 1699, 1543, 7489, 2663, 4583, 7829, 2749, 4177, 5179, 2389, 13291, 20389, ...
What is the asymptotic behavior of this sequence?
Conjecture: a(n) > 0 for all values of n. - Altug Alkan, Jan 11 2017
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..1000
FORMULA
EXAMPLE
PROG
(PARI) a(n) = {my(k = 1); while (!istotient((2*n)^k), k++); k; }
CROSSREFS
KEYWORD
nonn
AUTHOR
Altug Alkan, Jan 08 2017
STATUS
approved