21941

Appears in sequences

• a(n) = 16n^2 + n.at n=36A157474
• a(n) = 1369*n^2 + 37.at n=4A158741
• a(n) = binary code (shown here in decimal) of the position of natural number n in the beanstalk-tree A218778.at n=37A218614
• a(n) = binary code (shown here in decimal) of the position of the predecessor of the natural number pair (2n,2n+1) in the compact beanstalk-tree A218782.at n=19A218790
• Positive integers whose square is the sum of 74 consecutive squares.at n=2A257825
• Expansion of Product_{k>=1} (1 + x^(2*k+1))^k.at n=48A263149
• a(n) is the number of regions formed by n-secting the angles of a decagon.at n=32A335800