21130

Appears in sequences

• G.f.: A(x) = ( G(x)^5 - G(x^5) - 5*x*((1-x^4)/(1-x))/(1-x^5) )/(25*x^2) where G(x) is the g.f. of A110631.at n=16A111583
• Starts of runs of 3 consecutive factorial base Niven numbers (A118363).at n=12A328206
• Starts of runs of 3 consecutive lazy-tribonacci-Niven numbers (A352107).at n=5A352109