Thursday, July 11, 2013

prime day

today is a prime sequence day: 7-11-13. this is the next-to-last time this will happen this century; the last one will be 11-13-17. Last Prime Day sounds ominous.

the preceding is only really true in places, i.e. the USA, where we use the month-day-year notation for dates (and if we ignore the century count). if we use the more typical ordering of day-month-year, the Last Prime Day will be this November 7th: 7-11-13, and then no more until the 1st of February, 2103. (the first American Prime Day of the next century will be January 2nd of the same year).

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