An Aesthetic or Esthetic Number is defined by Numbers Aplenty as a number
10, 12, 21, 23, 32, 34, 43, 45, 54, 56, 65, 67, 76, 78, 87, 89, 98, 101, 121, 123, 210, 212, 232, 234, 321, 323, 343, 345, 432, 434, 454, 456, 543, 545, 565, 567, 654, 656, 676, 678, 765, 767, 787, 789, 876, 878, 898, 987, 989, 1010, 1012, 1210, 1212, 1232, 1234, 2101, 2121, 2123, 2321, 2323, 2343, 2345, 3210, 3212, 3232, 3234, 3432, 3434, 3454, 3456, 4321, 4323, 4343, 4345, 4543, 4545, 4565, 4567, 5432, 5434, 5454, 5456, 5654, 5656, 5676, 5678, 6543, 6545, 6565, 6567, 6765, 6767, 6787, 6789, 7654, 7656, 7676, 7678, 7876, 7878, 7898, 8765, 8767, 8787, 8789, 8987, 8989, 9876, 9878, 9898, 10101, 10121, 10123, 12101, 12121, 12123, 12321, 12323, 12343, 12345, 21010, 21012, 21210, 21212, 21232, 21234, 23210, 23212, 23232, 23234, 23432, 23434, 23454, 23456, 32101, 32121, 32123, 32321, 32323, 32343, 32345, 34321, 34323, 34343, 34345, 34543, 34545, 34565, 34567
Here are the frequencies for base 10 numbers being aesthetic in smaller bases in the range from 10 to 40000:
- base 9 - 165 e.g. 37825 --> 56787
- base 8 - 171 e.g. 33436 --> 101234
- base 7 - 164 e.g. 36881 --> 212345
- base 6 - 188 e.g. 38657 --> 454545
- base 5 - 182 e.g. 36119 --> 2123434
- base 4 - 188 e.g. 39867 --> 21232323
- base 3 - 134 e.g. 36905 --> 1212121212
- base 2 - 12 e.g. 21845 --> 101010101010101
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