137868

Appears in sequences

• Numbers k such that k divides 1 + Sum_{j=1..k} prime(j)^2 = 1 + A024450(k).at n=27A128166
• Number of n X 3 binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.at n=7A268735
• T(n,k)=Number of nXk binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.at n=47A268740