TheNumber Seven- Facts                                                                                                     Within a period of seven years a human being changes, so is it said. Thenumber seven plays a major role in our lives, whether we know of it or not.

  Seven circlesform the symbol called “The Seed of Life”. The Seed of Life symbolizes the sixdays of creation. The central circle symbolizes the day of rest.     IN MATH?    Sevenis the lowest natural number that cannot be represented as the sum of thesquares of three integers. ?    7is the only number D forwhich the equation 2n ? D = x2 has more than two solutions for n and x natural.

In particular, the equation 2n ? 7 = x2 is known asthe Ramanujan–Nagell equation.?    Whenrolling two standard six-sided dice, seven has a 6 in 36 (or 1/6)probability of being rolled (1–6, 6–1, 2–5, 5–2, 3–4, or 4–3), the greatest ofany number.?    The MillenniumPrize Problems are seven problems in mathematics that werestated by the Clay Mathematics Institute in 2000. ?    Asequence of prime numbers: 9999907, 999907, 99907, 9907, 907 and 07.?    Theminimum number of perfect riffle shuffles (when the deck is cut exactly in halfand the cards are perfectly interlaced) to randomize a 52-card deck.?    Thenumber of colors needed to paint a donut-shaped map to ensure that no adjacentareas/countries are of the same color.

?    Eachratio 16758/2394 = 18459/2637 = 31689/4527 = 36918/5274 = 37926/5418 =41832/5976 = 53298/7614 = 7, using each of 9 digits 1-9 once, shows how toarrange a 9-book set on 2 shelves to mark the book #7.?    Thefirst Woodall prime number: 2×22–1 = 7. The first Woodall prime numbers (of theform n×2n–1) are with n = 2, 3, 6, 30, 75, 81…?    Sumof all prime numbers from 7 to 53 is the product of 2 numbers themselves, 7 and53:           371 = 7×53 = 7+11+13+17+19+23+29+31+37+41+43+47+53.

 

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