80199

Appears in sequences

• Intersection of A065764 and A065765: n such that x and y exist with sigma[x^2] = n = sigma[2*(y^2)].at n=6A065767
• Numbers k such that if you subtract k from its reversal you get a positive number with the same digits as k.at n=19A121970
• a(n) = sqrt(sigma(2*m^2)), where m = A097023(n), i.e., sigma(2*m^2) is a square.at n=10A163764
• Odd numbers m such that sigma(x) = m has more than 1 solution.at n=27A300869
• Number of semi-lone-child-avoiding rooted trees with at most one distinct non-leaf branch directly under any vertex.at n=24A331933