A014874 Numbers k that divide s(k), where s(1)=1, s(j)=23*s(j-1)+j.

1, 11, 23, 121, 253, 1331, 2783, 10603, 14641, 29647, 30613, 87967, 116633, 161051, 326117, 336743, 967637, 1282963, 1771561, 2023241

Offset

1,2

Links

Table of n, a(n) for n=1..20.

Maple

# Maple code from N. J. A. Sloane, Jan 02 2021
# To test if n is a member:
f:=proc(n) local s, k;
s:=0;
for k from 1 to n do s:=(23*s+k) mod n; od;
if s=0 then 1 else -1; fi;
end;
# To compute the terms up to 10000:
ans:=[]; for n from 1 to 10000 do if f(n)=1 then ans:=[op(ans), n]; fi; od: ans;

Crossrefs

Sequence in context: A146084 A179520 A288406 * A027899 A106388 A171068

Adjacent sequences: A014871 A014872 A014873 * A014875 A014876 A014877

Keyword

nonn,more

Author

N. J. A. Sloane, Olivier Gérard

Extensions

More terms from Kok Seng Chua (chuaks(AT)ihpc.nus.edu.sg), Jan 30 2001

Status

approved