71267

Appears in sequences

• Number of numbers below 10^n with nonzero multiplicative digital root 7.at n=6A051827
• Numbers k that, when expressed in base 6 and then interpreted in base 9, give a multiple of k.at n=21A062939
• a(n) = (4*n^4 - 4*n^3 - n^2 + 3*n)/2.at n=13A135400
• G.f.: Sum_{k>=1} x^(2*k)/(1+x^(2*k)) * Product_{k>=1} 1/(1-x^k).at n=41A305121