# Tetrahedral

Tetrahedral

35 is the sum of the first five triangular numbers, making it a tetrahedral number.

35 is a centered cube number, a pentagonal number and a pentatope number.

35 is a highly cototient number, since there are more solutions to the equation x – φ(x) = 35 than there are for any other integers below it except 1.

There are 35 free hexominoes, the polyominoes made from six squares.

Since the greatest prime factor of 352 + 1 = 1226 is 613, which is obviously more than 35 twice, 35 is a Størmer number.

35 is a discrete semiprime (or biprime) (5 × 7); the tenth, and the first with 5 as the lowest non-unitary factor. The aliquot sum of 35 is 13 this being the second composite number with such an aliquot sum; the first being the cube 27. 35 is the last member of the first triple cluster of semiprimes 33,34,35. 85,86,87 is the second such triple discrete semiprime cluster.

35 is the highest number one can count to on one’s fingers using base 6.

35 is the atomic number of bromine.

35 mm film is the basic film gauge most commonly used for both analog photography and motion pictures.

35 in Ancient Rome, the age of a man in his prime, at which he was eligible to become a consul.

35 is the minimum age (in years) of candidates for election to the position of President of the United States, President of Ireland and President of Poland.

Rule 35 of the internet states that if there is no pornography of it, there will be.

Reference: Wikipedia

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Posted on 11 February 2011, in Me and tagged , , , . Bookmark the permalink. 1 Comment.

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