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The challenge involves mathematics. Also consider using more specific tags: [number] [number-theory] [arithmetic] [combinatorics] [graph-theory] [geometry] [abstract-algebra].

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Kotlin, 152 119 bytes {a:Int,b:Int->(a..b).map{String.format("%06d",it)}.filter{it[0].toInt()+it[1].toInt()+it[2].toInt()==it[3].toInt()+it[4].toInt()+it[5].toInt()}.count()} Try it online! Taking …
answered Jul 21 '18 by YGolybev