581740

Appears in sequences

• a(n)=a(n-1)*(2^K)+ n*(n+1)/2 ; a(0)=1; K=floor(log_2 n*(n+1)/2).at n=7A136310
• Collatz (or 3x+1) trajectory starting at 10087.at n=20A161022
• 1-sequence of reduction of (3n-2) by x^2 -> x+1.at n=19A192312