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# Smallest k such that n, k and n+k have the same prime signature (canonical form), or 0 if no such number exists.
# https://oeis.org/A085080
# Here is a temporary list of integers <= 1000 for which a(n) is unknown (greater than a(48) or 0): 72, 200, 288, 432, 500, 648, 800, 864, 968, 972. - Michel Marcus, David A. Corneth, Mar 08 2019
# Try to find upper-bounds, using the Chinese remainder theorem.