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by ddstuder
Wed Dec 28, 2011 2:25 pm
Forum: Off-Topic
Topic: 1
Replies: 8528
Views: 1247327

Re: 1

143

143 is the sum of three consecutive primes (43 + 47 + 53), as well as the sum of seven consecutive primes (11 + 13 + 17 + 19 + 23 + 29 + 31). But this number is never the sum of an integer and its base 10 digits, making it a self number.

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