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Mathematics, 02.11.2019 20:31 mistymjoy
Nthe sequence $121, 1221, 12221, \dots ,$ the $n$th number consists of $n$ copies of the digit $2$, surrounded by two $1$s. how many of the first $100$ terms in the sequence are divisible by $3$?
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Nthe sequence $121, 1221, 12221, \dots ,$ the $n$th number consists of $n$ copies of the digit $2$,...
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