The smallest prime Simple Mail Transfer Protocol (SMTP) reply code. It means system status, or system help reply.
211 is a prime lucky number and there are 211 prime lucky numbers less than 102+1+1. [Post]
211 is the product of the first four primes plus one. [Patterson]
As of September 2002, the U.S. Patent Office had exactly 211 patents in its database which contain the word 'prime' in their title. [Rupinski]
3^5 - 2^5 = 211, which is prime. [La Haye]
The number of primes that can appear on a 24-hour digital clock (00:00 up to 23:59). [De Geest]
2-1-1 is an easy-to-remember telephone number that connects people with important community services and volunteer opportunities in the United States: http://www.211.org/. [Haga]
G. H. Hardy once sent a postcard to his friend Ramanujan with a list of six New Year's resolutions beginning: (1) prove the Riemann hypothesis; (2) Make 211 not out in the fourth innings of the last Test Match at Oval; (3) ....
The smaller of the only two primes formed from consecutive digits repeated each-other times: one 2, two 1s. [Silva]
The smallest prime formed from two other primes, one of which is the sum of the digits of the other. [Silva]
211 (in the 6th shell of a Modulo-40 unit circle) is congruent with the prime number 20731 (in the 519th shell of a Modulo-40 unit circle). Both primes occupy position #11 in their respective shells. [Roberts]
Sodium benzoate (E211) can be produced by reacting sodium hydroxide with benzoic acid.
The minimum sum of any row, column, or diagonal, of a minimum difference prime magic square that contains the 25 primes less than 100 (Kurchan and Reed, 1994).
41 79 17 13 61 53 03 83 67 07 59 97 05 23 29 11 31 37 89 43 47 02 71 19 73
A 'month of Sundays', connoting a long period of time and often regarded as the period of time for someone else to perform a task that you consider to be straightforward, is literally 211 days (7*30 + 1). The first Sunday is to occur on the first of the 211 days and the 31st Sunday occurs on the 211th day. [Green]
The only 3-digit prime such that the sum of any two of its digits is also prime. [Green]
(There are 4 curios for this number that have not yet been approved by an editor.)
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