266587

Properties

Appears in sequences

• a(1)=1; thereafter, if n even, a(n) = a(n-1)-st prime, and if n odd, a(n) = a(n-1)-st nonprime.at n=13A280028
• Number of nX3 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=30A317736
• Prime numbersat n=23356