51910

Appears in sequences

• Square spiral sequence: numbers are placed in a square spiral, a(1)=1, a(n) is found as the sum of the row (in the previous direction) a(n-1) is in.at n=30A062410
• Values of A062410 on folding point positions of the spiral.at n=9A063254
• f-amicable numbers where f(n) = n+1.at n=9A066505
• Coefficients in the expansion of 1/([r]-[2r]x+[3r]x^2-...); [ ]=floor, r=8/5.at n=19A289260