Find the least non negative residues mod 7,11 and 13 of 12345678.
my attempt: A number N is congruent modulo 7, 11, or 13, to the alternating sum of its digits in base 1000. (For example, 123456789 ≡ 789 − 456 + 123 ≡ 456 mod 7, 11, or 13.)
Answer
What I can do if I have understood well the question is the clear
12345678=949667⋅13+7=1122334⋅11+4=1763668⋅7+2 where the asked residues are in red.
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