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Friedman number - Wikipedia, the free encyclopedia |
 | | A Friedman number is an integer which, in a given base, is the result of an expression using all its own digits in combination with any of the four basic arithmetic operators (+, -, ×, ÷) and sometimes exponentiation. |
 | | 25, 121, 125, 126, 127, 128, 153, 216, 289, 343, 347, 625, 688, 736, 1022, 1024, 1206, 1255, 1260, 1285, 1296, 1395, 1435, 1503, 1530, 1792, 1827, 2048, 2187, 2349, 2500, 2501, 2502, 2503, 2504, 2505, 2506, 2507, 2508, 2509, 2592, 2737, 2916, 3125, 3159, 3375 (sequence A036057 in OEIS) |
 | | A nice Friedman number is a Friedman number where the digits in the expression can be arranged to be in the same order as in the number itself. |
| en.wikipedia.org /wiki/Friedman_number (779 words) |
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