Math Notes
12157692622039623539 = 11 + 22 + 13 + 54 + 75 + 66 + 97 + 28 + 69 + 210 + 211 + 012 + 313 + 914 + 615 + 216 + 317 + 518 + 319 + 920
(The largest such number.)
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