25241

Appears in sequences

• Numbers x such that sigma(x)-x divides x-1, other than prime powers.at n=10A059047
• Product of the square matrix in A065941 and the column vector (1, 2, 3, ...)'.at n=16A131913
• Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.at n=4A227636
• Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.at n=4A227640
• T(n,k)=Number of nXk 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(k+1) binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.at n=40A227641
• Number of nX7 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,0) or (-1,1) and new values introduced in order 0..2.at n=4A275182
• Number of 5 X n 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,0) or (-1,1) and new values introduced in order 0..2.at n=6A275185
• Composite numbers whose sum of aliquot parts divide the sum of the squares of their aliquot parts.at n=41A301482