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Quasi-sociable numbers or reduced sociable numbers are numbers whose aliquot sums minus one form a cyclic sequence that begins and ends with the same number. They are generalizations of the concepts of betrothed numbers and quasiperfect numbers. The first quasi-sociable sequences, or quasi-sociable chains, were discovered by Mitchell Dickerman ...
All cars in a unit had same last two digits: second digit even for A-end cars and odd for D-end cars. 39xx 49xx: 1960: 39xx DM 49xx T: Fourth digit was even for A-end cars and odd for D-end cars; the original trailers (converted from Standard Stock) were later replaced by trailers converted from 1938 Stock, whose numbers did not correspond with ...
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The period of the sequence, or order of the set of sociable numbers, is the number of numbers in this cycle. If the period of the sequence is 1, the number is a sociable number of order 1, or a perfect number—for example, the proper divisors of 6 are 1, 2, and 3, whose sum is again 6.
Formats for license plate numbers are consistent within the state. For example, Delaware is able to use six-digit all-numeric serials because of its low population. Several states, particularly those with higher populations, use seven-character formats of three letters and four digits, including 1ABC234 in California, 1234ABC in Kansas and ABC-1234 (with or without a space or dash) in Georgia ...
The following is a list of all the cars that have raced in the combined history of the Bathurst 1000 motor race, from the 1960 Armstrong 500 up until today and including both races that were held in 1997 and 1998.
With the 60th Inauguration a week away, officials are starting to distribute more than 220,000 tickets to the public. Beginning Monday, Jan. 13, the color-coded tickets are being sent to members ...
All the Allstate Basic models were dropped and Allstate prices jumped substantially; the entry-level Series 4 Standard Model 210 sold for $1,528 and the DeLuxe Model 213 for $1,589. The Series 6 was now only offered in the upscale DeLuxe Model 215 version at $1,785 and was the most popular Allstate that year.