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We have
a(3) = 103*2 = 206.
a(4) = 401*23 = 9223.
a(5) = 503*421 = 211763.(and not 523*401 which is smaller)
a(6) = 6421*503 = 3229763.(and not 5021*643 which is smaller)
a(7) = 7451*6203 = 46218553.(and not 7043*6521 which is smaller)
a(8) = 85201*7643 = 651191243.(and not 76423*8501 which is smaller)
a(9) = 96401*87523 = 8437304723.(and not 96703*84521 which is smaller)
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