118405

Appears in sequences

• 4-dimensional analog of centered polygonal numbers: a(n) = n(n+1)*(n^2+n+4)/12.at n=34A006007
• Strong pseudoprimes to base 86.at n=28A020312
• Numbers k such that sigma(sigma(k)-k) = phi(k).at n=18A074875
• Odd composite numbers k for which k = A140607((k-1)/2).at n=8A140667
• a(n) = n*(n+1)*(6*n-5)/2.at n=34A172082
• Numbers that have exactly 7 representations as a k-gonal number, P(n,k) = n*((k-2)*n - (k-4))/2, k and n >= 3.at n=23A321157
• Terms of A324315 (squarefree integers m > 1 such that if prime p divides m, then the sum of the base p digits of m is at least p) that are also octagonal numbers (A000567) with index equal to their largest prime factor.at n=10A324320