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using multiplication facts is that You just memorize the multiplications so, 6 x 9 = 54
Some multiplication facts for 81 are 9 x 9 3 x 27 1 x 81
9 is a composite number9 is a positive number
I wonder if you mean Trofim Lysenko, who was a Soviet agronomist and politician who died in 1976. If so you might be interested in his wikipedia article.
3 and 9 are the only common integers (Ze {-inf; ..... ; -3; -2;-1;0;1;2;3;4;.......;inf})