+120
+3 Jun 11, 2025
+17
+1231 Consider the set
S = {1, 2, 3, 4, 5, 6, 7, 8, 12, 13, 14, 15, 16, 17, 18, 23, 24, ..., 12345678},
which consists of all positive integers whose digits strictly increase from left to right, and the digits are from 1 to 8. This set is
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+1231 Jun 10, 2025
+5 Jun 9, 2025
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May 29, 2025
+833 May 28, 2025
+707
+178 May 27, 2025
+466
+343
+810
+1231 May 26, 2025
+8 May 25, 2025
+1231 May 24, 2025
May 23, 2025
+9