75140

Appears in sequences

• Ruth-Aaron numbers (1): sum of prime divisors of n = sum of prime divisors of n+1.at n=37A006145
• a(n) = 65*n^2.at n=33A165798
• For every positive integer m, let u(m) = (d(1),d(2),...,d(k)) be the unitary divisors of m. The sequence (a(n)) consists of successive numbers m which d(k)/d(1) + d(k-1)/d(2) + ... + d(k)/d(1) is an integer.at n=20A229996
• Number of Dyck paths of semilength n and height exactly 7.at n=6A289420
• Numbers whose square can be represented in exactly three ways as the sum of a positive square and a positive fourth power.at n=8A345968
• Smaller term of each Ruth-Aaron pair in which the sum of distinct prime factors is a prime number.at n=9A372455