144020

Appears in sequences

• a(n) is the smallest number m such that phi(m)+sigma(m)=n*pi(m).at n=25A145747
• Expansion of (1-4*x+7*x^2-5*x^3+4*x^4-6*x^5+21*x^6+18*x^7-5*x^8)/(1-x)^5.at n=22A212393
• Number of ways to stack n triangles symmetrically (pointing upwards or downwards depending on row parity).at n=40A316585