Archive Monthly Archives: November 2011

Surprising My Wife at 40

40. An interesting number. According to Wikipedia: Forty is an octagonal number, and as the sum of the first four pentagonal numbers, it is a pentagonal pyramidal number. Adding up some subsets of its divisors (e.g., 1, 4, 5, 10 and 20) gives 40, hence 40 is a semiperfect number. Some say turning 40 is a milestone in ones life. […]

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Surprising My Wife at 40

40. An interesting number. According to Wikipedia: Forty is an octagonal number, and as the sum of the first four pentagonal numbers, it is a pentagonal pyramidal number. Adding up some subsets of its divisors (e.g., 1, 4, 5, 10 and 20) gives 40, hence 40 is a semiperfect number. Some say turning 40 is a milestone in ones life. […]

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