615681

Appears in sequences

• Numbers that have exactly 9 representations as a k-gonal number, P(n,k) = n*((k-2)*n - (k-4))/2, k and n >= 3.at n=7A321159
• Value of p^2 + (p-1)^2/2 as p runs through A001359 (the lesser of twin primes).at n=28A372069