|
%I #51 Dec 30 2023 01:59:42
%S 1,3,7,13,182,43,1068,47,268,443,15905182,157,1832311432,14557,16432,
%T 307,255250280182,1407,355101282318,3307,92682,3626068,
%U 21346690797155182,993,313932,-1,51982,16693,-1,2943,-1,2163,-1,-1,-1,3957
%N a(n) is the smallest positive k such that k^2 + 1 has 2*n divisors, or -1 if no such k exists.
%Y Cf. A193432.
%K sign
%O 1,2
%A _Jon E. Schoenfield_, May 15 2022
|
