177568

Appears in sequences

• a(n) = Sum_{k=0..n} S(k)*S(n-k), convolution of S=A001644 with itself.at n=15A073782
• Consider the sum of the divisors of a number x>1. Take the sum of its digits. Repeat the process deleting the first addendum and adding the previous sum. The sequence lists the numbers that after some iterations reach x.at n=13A269307