Its prime time today Another mathematical oddity

first_imgAre you feeling it?Something… special in the air?Turns out July 26, 2011 is another standout date in the numbers-obsessed world of Inan Aziz, University of Portland electrical engineering professor, who gets mighty fired up about these things.Ignore our lackluster, gray July morning (sigh). Forget, for a moment, the numbing spin of digits on the national debt clock and such.Nope, this particular Tuesday is actually one prime, prime… and prime, day.We’ll let Aziz spell it out:“…The single full date of July 26, 2011 is extremely rare since 7262011 = 191 x 193 x 197, i.e., the product of three consecutive prime numbers! There are only 2 such dates in this (3rd) millennium and both happen to be in this (21st) century!”OK. Feel better now?Of course, Prof. Aziz has much more to say. Read on, for entertainment’s sake (Aziz readily concedes there’s no larger meaning to his calendar-centric hobby). Or don’t — but, at least, acknowledge the enthusiasm here(!!)=====================“The single full date number of July 26, 2011 expressed in the month/day/year date format is 7262011 and guess what, this number equals the product of three consecutive prime numbers, i.e., 7262011 = 191 x 193 x 197!! (Interestingly enough, the reverse of this date number 1102627 also equals the product of three prime numbers (but not consecutive), that is, 1102627 = 19 x 131 x 443! Fascinating!!)Based on my calculations, the last time this type of date happened was in 1933 on August 7 (since 871933 = 89 x 97 x 101!). (Before this, it occurred in 1833 on August 27 since 8271833 = 197 x 199 x 211!)last_img

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