Timeline for Does the set of happy numbers have a limiting density?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| Oct 19, 2011 at 2:07 | history | edited | Joe Silverman | CC BY-SA 3.0 |
Added a new reference
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| Oct 18, 2011 at 3:33 | vote | accept | Dave R | ||
| Oct 19, 2011 at 5:43 | |||||
| Oct 16, 2011 at 5:10 | comment | added | KConrad | There is no citation in the Wikipedia reference (Richard Guy's Unsolved Problems in Number Theory, p. 357) indicating how happy numbers may have originated in Russia. I wonder if there is confusion here with a happy ticket, which is a bus or train ticket in Russia for which the sum of the first half of the digits equals the sum of the second half of the digits. See bilet.hdd1.ru/en, where most likely you will see an example of a ticket that is not happy and you can click on Try Again to generate another random ticket number. For 6 digit numbers the chance of a happy ticket is 5.5%. | |
| Oct 16, 2011 at 3:31 | history | answered | Joe Silverman | CC BY-SA 3.0 |