138229

Appears in sequences

• a(n) = (n+1)^3*(2n+1)(5n+1).at n=6A109117
• Odd composite numbers k such that Sum_{i=1..k-1} 2^i * i^(k-2) == Sum_{i=1..(k-1)/2} i^(k-2) (mod k).at n=39A373734