Re: challenge problem
- To: mathgroup at smc.vnet.net
- Subject: [mg61291] Re: [mg61219] challenge problem
- From: Zhengji Li <zhengji.li at gmail.com>
- Date: Fri, 14 Oct 2005 05:56:10 -0400 (EDT)
- References: <200510130539.BAA04503@smc.vnet.net> <a6e65e8d0510131901t7a5eee74q74469892d454bf5@mail.gmail.com>
- Sender: owner-wri-mathgroup at wolfram.com
A further look at the lucky sevens showing that they are in the form:
7, 77, 777, ....
So we can get the result just in a blink:
Sum[7 FromDigits@Table[1, {i}], {i, 11}]
86419753077
--
Li Zhengji
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If all you have is a hammer, everything is a nail.
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- References:
- challenge problem
- From: Murray Eisenberg <murray@math.umass.edu>
- challenge problem