79272

Appears in sequences

• The sum of the first n terms of the sequence is the concatenation of the first n digits of the sequence, and a(1) = 8.at n=4A299871
• a(n) = Sum_{i+j+k+l=n, i,j,k,l >= 1} sigma(i)*sigma(j)*sigma(k)*sigma(l).at n=13A374977
• Place a point on the integer coordinates, up to |n|, along all four axial directions on a Cartesian plane, and then join a circle through every unordered triple of non-collinear points: a(n) is the number of distinct (curved) edges formed from the intersections of the circles.at n=3A385162