135201

Appears in sequences

• a(n) = Sum_{d|n} phi(n/d)^d, where phi = Euler totient function (A000010).at n=50A309369
• 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=31A321157
• Numbers that are the sum of ten fifth powers in four or more ways.at n=27A345636
• Numbers that are the sum of ten fifth powers in exactly four ways.at n=27A346349
• Composite numbers k == 1, 9 (mod 10) such that 5^((k-1)/2) == 1 (mod k).at n=36A375915
• Number of polycubes of size n and symmetry class E.at n=11A376969