{"product_id":"prime-sieve-cotton-dress-shirt-prime-numbers-oxblood-and-ivory","title":"Prime Sieve Cotton Dress Shirt: Prime Numbers — Oxblood \u0026 Ivory","description":"\u003cp\u003e\u003cstrong\u003eWrite the numbers in rows, and the primes fall into place.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMore than two thousand years ago, Eratosthenes of Cyrene found the primes by crossing numbers out using a simple process: Remove every multiple of 2, then of 3, then of 5, and so on. Whatever survives can be divided only by itself and one. In this print every number is a dot: the pale ones crossed out, and the colored ones are prime.\u003c\/p\u003e\n\u003cp\u003eIf you write the numbers in rows, the width of the row decides the picture.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePrime Numbers.\u003c\/strong\u003e Rows 751 numbers wide. 751 is itself prime, and each row is one longer than 750, so the stripes made by 2, 3 and 5 slip one place every row into diagonals.\u003c\/p\u003e\n\u003ch3\u003eWho it’s for\u003c\/h3\u003e\n\u003cp\u003ePrime numbers guard almost everything sent over the internet: the encryption behind online banking and secure websites rests on how hard it is to split a large number into its primes. Made for cryptographers, security engineers, software developers, data scientists and anyone who has ever wondered why numbers are so strange.\u003c\/p\u003e\n\u003cp\u003eA formal shirt with a conversation in it: for conference talks, thesis defenses, interviews, weddings and dinners. A thoughtful gift for the scientist, engineer or programmer with great taste.\u003c\/p\u003e\n\u003ch3\u003eThe Cotton Dress Shirt\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLightweight 100% cotton (110 g).\u003c\/li\u003e\n\u003cli\u003eLong sleeves with buttoned cuffs, collar and a single chest pocket.\u003c\/li\u003e\n\u003cli\u003ePrinted edge to edge, across collar, cuffs and pocket.\u003c\/li\u003e\n\u003cli\u003eEuropean sizing: please check the size guide below before ordering.\u003c\/li\u003e\n\u003cli\u003eWash by hand or on a gentle cycle below 45 °C. Do not soak or bleach.\u003c\/li\u003e\n\u003cli\u003eNot quite the right fit? Tell us within 30 days and we’ll make it right.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSize guide\u003c\/h3\u003e\u003cp\u003eMeasurements around the body, in cm (inches). Allow 1–3 cm either way.\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003cth\u003eChest\u003c\/th\u003e\n\u003cth\u003eShoulder\u003c\/th\u003e\n\u003cth\u003eSleeve\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eS\u003c\/td\u003e\n\u003ctd\u003e74 (29.1)\u003c\/td\u003e\n\u003ctd\u003e108 (42.5)\u003c\/td\u003e\n\u003ctd\u003e52 (20.5)\u003c\/td\u003e\n\u003ctd\u003e61 (24.0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM\u003c\/td\u003e\n\u003ctd\u003e76 (29.9)\u003c\/td\u003e\n\u003ctd\u003e114 (44.9)\u003c\/td\u003e\n\u003ctd\u003e53.5 (21.1)\u003c\/td\u003e\n\u003ctd\u003e62 (24.4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e78 (30.7)\u003c\/td\u003e\n\u003ctd\u003e120 (47.2)\u003c\/td\u003e\n\u003ctd\u003e55 (21.7)\u003c\/td\u003e\n\u003ctd\u003e63 (24.8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003ctd\u003e80 (31.5)\u003c\/td\u003e\n\u003ctd\u003e126 (49.6)\u003c\/td\u003e\n\u003ctd\u003e56.5 (22.2)\u003c\/td\u003e\n\u003ctd\u003e64 (25.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2XL\u003c\/td\u003e\n\u003ctd\u003e82 (32.3)\u003c\/td\u003e\n\u003ctd\u003e132 (52.0)\u003c\/td\u003e\n\u003ctd\u003e58 (22.8)\u003c\/td\u003e\n\u003ctd\u003e65 (25.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3XL\u003c\/td\u003e\n\u003ctd\u003e83 (32.7)\u003c\/td\u003e\n\u003ctd\u003e140 (55.1)\u003c\/td\u003e\n\u003ctd\u003e60 (23.6)\u003c\/td\u003e\n\u003ctd\u003e66 (26.0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4XL\u003c\/td\u003e\n\u003ctd\u003e84 (33.1)\u003c\/td\u003e\n\u003ctd\u003e148 (58.3)\u003c\/td\u003e\n\u003ctd\u003e62 (24.4)\u003c\/td\u003e\n\u003ctd\u003e67 (26.4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5XL\u003c\/td\u003e\n\u003ctd\u003e85 (33.5)\u003c\/td\u003e\n\u003ctd\u003e156 (61.4)\u003c\/td\u003e\n\u003ctd\u003e64 (25.2)\u003c\/td\u003e\n\u003ctd\u003e68 (26.8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6XL\u003c\/td\u003e\n\u003ctd\u003e86 (33.9)\u003c\/td\u003e\n\u003ctd\u003e164 (64.6)\u003c\/td\u003e\n\u003ctd\u003e68 (26.8)\u003c\/td\u003e\n\u003ctd\u003e69 (27.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eEvery Zenzicube design is grown from a real piece of mathematics. 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