Wasteful, equidigital and frugal numbers: Difference between revisions
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By convention, the number '''1''' is considered to be an '''equidigital''' number in '''any''' base even though it has no prime factors. |
By convention, the number '''1''' is considered to be an '''equidigital''' number in '''any''' base even though it has no prime factors. |
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For the avoidance of any doubt, the number '''0''' is not a positive integer (and arguably not a [[wp:Natural_number|''natural number'']] either) and so is excluded from all 3 categories. |
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An '''economical''' number is sometimes defined as being one for which l(n) '''>=''' D(n) though this usage won't be followed here. |
An '''economical''' number is sometimes defined as being one for which l(n) '''>=''' D(n) though this usage won't be followed here. |
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