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Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
Occasionally, a real number serves as an Easter egg, as the publisher directs a number they own to a promotional message, a contest line or other content which ties into the original programme. Phone numbers whose exchanges begin with 1 are also occasionally used as fictional numbers.
Isopsephy (/ ˈaɪsəpˌsɛfi /; Greek: ἴσος, romanized: ísos meaning "equal" and Greek: ψῆφος, romanized: psêphos, lit. 'pebble' meaning "count") or isopsephism is the practice of adding up the number values of the letters in a word to form a single number. [1] The total number is then used as a metaphorical bridge to other words ...
The sequence of highly composite numbers (sequence A002182 in the OEIS) is a subset of the sequence of smallest numbers k with exactly n divisors (sequence A005179 in the OEIS). Highly composite numbers whose number of divisors is also a highly composite number are. 1, 2, 6, 12, 60, 360, 1260, 2520, 5040, 55440, 277200, 720720, 3603600 ...
There are known formulae to evaluate the prime-counting function (the number of primes smaller than a given value) faster than computing the primes. This has been used to compute that there are 1,925,320,391,606,803,968,923 primes (roughly 2 × 10 21 ) smaller than 10 23 .
268 7xx. 10. NANP member. Argentina. +54. 9/15. 10. All carriers: Claro, Movistar, Personal, Tuenti. 15 before the local number but after long distance area code for national calls (0 11 15 xxxx-xxxx) and 9 placed after the international access code excluding the 15 for international calls (+54 9 11 xxxx-xxxx).
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