113013

Appears in sequences

• Numbers k that can be expressed as k = w + x = y*z with w*x = y^2 + z^2 where w, x, y, and z are all positive integers.at n=24A057373
• Table read by rows, where n-th row is denominators of Egyptian fraction, derived using the greedy algorithm, of the n-th harmonic number (Sum_{k=1..n} 1/k).at n=42A106394
• Amicable pairs (x, y) under the following transform: x mod (2, 3, 4, ..., i+1) = (b_i, b_i-1, ..., b_1), where b_1, b_2, ..., b_i are the digits of y, with MSD(y) = b_i and LSD(y) = b_1; y mod (2, 3, 4, ..., j+1) = (c_j, c_j-1, ..., c_1), where c_1, c_2, ..., c_j are the digits of x, with MSD(x) = c_j and LSD(x) = c_1.at n=1A389857