Tuesday, April 5, 2011

Harshad numbers

http://www.harshad-numbers.com
http://en.wikipedia.org/wiki/Harshad_number
http://en.wikipedia.org/wiki/1729_(number)

Inverse Symbolic Calculator
P.S. Infinity

Online encyclopedia of integer sequences

http://offline.computerra.ru/print/offline/1998/235/1098

Examples:
1. A019460: 2, 3, 3, 5, 10, 13, 39, 43, 172, …
2. A006567: 13, 17, 31, 37, 71, 73, 79, 97, 107, …
3. A001462: 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 6, …
4. A005228: 1, 3, 7, 12, 18, 26, 35, 45, 56, 69, …
5. A006751: 2, 12, 1112, 3112, 132112, 1113122112, …
6. A004000: 1, 2, 4, 8, 16, 77, 145, 668, ...
7. A007449: 7, 9, 40, 74, 1526, 5436, 2323240, 29548570, …
8. A006933: 2, 4, 6, 30, 32, 34, 36, 40, 42, 44, 46, 50, …

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