251251

Appears in sequences

• Strong pseudoprimes to base 10.at n=31A020236
• a(n) = (n+1)*(6*n^4 - 51*n^3 + 161*n^2 - 251*n + 251).at n=10A165281
• Odd composite numbers m for which A000111(m) == (-1)^( (m-1)/2 ) (mod m).at n=32A180942
• Numbers m such that exactly half of the a such that 0<a<m and (a,m)=1 satisfy a^(m-1) == 1 (mod m).at n=34A191311
• Numbers in A191311 but not in A129521.at n=17A191592
• Number of inequivalent ways to color the faces of a cube using at most n colors so that no two opposite sides have the same color.at n=14A282816