# 347

This number is a prime. The number of minesweepers that supported the D-Day convoys in World War II. The smallest prime such that the product of its digits is equal to 2 times the number of digits times the sum of digits. [Russo] The largest three-digit prime which remains prime when 2 is added to any of its digits, i.e., 547, 367, and 349, are primes. [Opao] Strobogrammatic primes on a calculator do not contain the digits 3, 4, or 7. The fictitional street number of Dracula's London house (347 Piccadilly) according to Leslie S. Klinger's book The New Annotated Dracula. [Post] The largest prime factor of 1!+2!+3!+4!+5!+6!+7!+8!+9!. [Upadhyay] There are exactly 347 even digits before the 347th odd digit of π. (347 is the smallest prime making the previous statement true.) [Keith] The only non-titanic-prime (emirp) of form 7^p+(p+1) for p a prime, (p=3). [Loungrides] (347, 743) is the first pair of emirps (p, q) such that 5^p and 5^q are both "apocalyptic numbers", i.e., numbers that contain the beast number. [Loungrides] 2^2*3^3*7^7*347^347-1 is the largest non-titanic prime of form 2^2*3^3*7^7*347^347*...* a(n-1)^a(n-1)*a(n)^a(n)-1, where n, a(n) and 2^2*3^3*...*a(n)^a(n) – 1 are prime, a(n)>a(n-1), and a(n) is minimal. Note that the previous such primes are: a(1) = 2^2-1 = 3, a(2) = 2^2*3^3-1 = 107, a(3) = 2^2*3^3*7^7*-1 = 88942643. [Loungrides] Number of chess games that end in checkmate after a half-dozen plies. Shula's 347 Grill serves up prime cuts in a contemporary setting with sports photos on the walls. There are 347 five-digit Honaker primes. [Gaydos] On November 24, 2018, Yusheng Du (杜宇生) broke the world record fastest time to solve a 3x3 Rubik's cube. He solved it in 3.47 seconds. [Apdos] The only emirp that can be represented as the number of lines in a Rhapsody of Homer’s Odyssey, (i.e. Rhapsody VΙI). This line says: «πὰρ δὲ γυνὴ δέσποινα λέχος πόρσυνε καὶ εὐνήν». [Loungrides] Apple Brandy Prime Cuts is a custom, USDA inspected abattoir for farmers and meat handlers located on 347 Thomas Street in North Wilkesboro, NC. [Ashley] H.B. Gibson, in his book Hypnosis: Its Nature and Therapeutic Uses, says the record period for a chicken remaining in hypnosis is 3 hours 47 minutes.

(There are 11 curios for this number that have not yet been approved by an editor.)