21921124

Appears in sequences

• Least square of the form 'sum of n successive terms of a geometric progression + 1', or 0 if no such square exists.at n=14A092960
• Number of nX2 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1.at n=13A204078
• Number of (n+2) X (2+2) 0..1 arrays with each row divisible by 5 and each column divisible by 7, read as a binary number with top and left being the most significant bits.at n=12A262753