OFFSET
1,1
FORMULA
Conjecture (Superseeker): a(n) = A263458(n)/2. - R. J. Mathar, Aug 02 2024
MATHEMATICA
Select[Range[350], Mod[#^(#+1), 2#+1]==#+1 &] (* Stefano Spezia, Jul 23 2024 *)
PROG
(Magma) [n: n in [0..350] | n^(n+1) mod (2*n+1) eq n+1];
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Jul 23 2024
STATUS
approved