87890625

Appears in sequences

• Reciprocal of n terminates with an infinite repetition of digit 7. Multiples of 10 are omitted.at n=5A064566
• Fifth column of triangle A067402.at n=6A067405
• 5th binomial transform of (1,4,0,0,0,0,...).at n=10A081040
• Numbers k such that k divides the concatenation of all divisors of k in ascending order other than 1 and k itself.at n=10A088376
• Odd solutions of phi(sigma(k)) = sigma(phi(k)).at n=13A159939
• Number of nX3 array permutations with each element not moved or moved diagonally or antidiagonally by one.at n=11A189274
• Expansion of g.f. (1+4*x)/(1-5*x).at n=11A270567
• Least number k such that k-th triangular number is the sum of two nonzero squares in exactly n ways.at n=10A274686
• Number of set partitions of [n] such that i-j is a multiple of ten for all i,j belonging to the same block.at n=32A275077