648648

Appears in sequences

• Kaprekar numbers: numbers k such that k = q + r and k^2 = q*10^m + r, for some m >= 1, q >= 0 and 0 <= r < 10^m. Here q and r must both have the same number of digits.at n=24A045913
• The full list of 6-Kaprekar numbers.at n=21A053397
• Least number which is the sum of four nonnegative cubes (not necessarily distinct and including zero) in n ways.at n=25A076749
• a(n) = n*(n-1)*A056219(n+1).at n=26A166870
• Consider a decimal number of k>=2 digits x = d_(k)*10^(k-1) + d_(k-1)*10^(k-2) + ... + d_(2)*10 + d_(1) and the transform T(x)-> (d_(k)+d_(k-1) mod 10)*10^(k-1) + (d_(k-1)+d_(k-2) mod 10)*10^(k-2) + ... + (d_(2)+d_(1) mod 10)*10 + (d_(1)+d(k) mod 10). Sequence lists the numbers x such that T(x) divides x.at n=30A244286
• Square roots of terms in A238237.at n=28A290449
• Kaprekar numbers that are the concatenation of two equal numbers.at n=7A381917
• Kaprekar numbers (A006886) that are divisible by the sum of their digits.at n=18A382165
• a(n) is the number of binary strings of length n which contain exactly one run of 1s of even length.at n=21A384497