172560

Appears in sequences

• Numbers k such that both the sum of the semiprime divisors of k and the sum of the prime divisors of k are squares.at n=21A227478
• Larger of semi-unitary amicable numbers pair: numbers (m, n) such that susigma(m) = susigma(n) = m + n, where susigma(n) is the sum of the semi-unitary divisors of n (A322485).at n=18A322542
• a(n) = Sum_{k=0..n} (k+1) * 2^k * binomial(k,n-k)^2.at n=8A390612