30216

Appears in sequences

• Numbers k such that sigma(k) - phi(k) is a 4th power.at n=29A115918
• Number of integers i in range [A000302(n-1)..A024036(n)] of permutation A163355/A163356 with A163915(i)=i, but not A163355(i)=i.at n=13A163913
• Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=6A302629
• Number of nX7 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=6A302634
• Number of 7Xn 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=6A302640
• Expansion of 1/(2 - Product_{k>=1} (1 + x^k)/(1 - x^k)).at n=8A320654