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Band 311 (pronounced "three eleven") got their name from a police code after one of the band's former members was charged with indecent exposure. [Puckett] The Federal Communications Commission (FCC) set aside the prime number 311, a telephone code now used in many U.S. Cities, for connection to police nonemergencies. 311 is the eleventh threedigit prime for which the sum of the squares of its digits is also a prime. Note that the sum here is eleven as well. [Trotter] 311 is the smallest number expressible as the sum of consecutive primes in four ways. [De Geest] Apartment number 311 is the first door to be knocked on in the movie Ace Ventura: Pet Detective. [Shadyac] Mickey Mantle's rookie card number 311 is prime. Note also that M+I+C+K+E+Y+M+A+N+T+L+E = 131 (A=1...Z=26), another prime which happens to contain the same digits as his rookie card number. [Rupinski] A righttruncatable prime that can be obtained by concatenating the first three noncomposite digits of . [Necula] The smallest threedigit prime that is the sum of three different threedigit primes. [Gallardo] Lesser of the first occurrence of a twin prime (311, 313) such that sets of digits of both primes are equal. [Firoozbakht] Timothy Leary claimed to have taken LSD a total of 311 times. [Coeburn] The largest prime of the form a^b  c^d, where a, b, c and d are the first 4 primes. 311 = 7^3  2^5. Curiously, 311 = prime(2^6). [Post] The smallest home prime for composite numbers, that is an emirp. [Loungrides] Sources of narrow spectrum radiation (UVB 311 nm) are considered to be the best for vitiligo and psoriasis treatment. [Homewood] The Transportation Security Administration (TSA) has a "311" for carryons. The smallest prime (emirp) that is the first of six consecutive primes that remain prime if you delete their first digit, i.e., 311, 313, 317, 331, 337, 347. [Loungrides]
(There are 11 curios for this number that have not yet been approved by an editor.)
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