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[1] [2] Every positive integer is composite, prime, or the unit 1, so the composite numbers are exactly the numbers that are not prime and not a unit. [ 3 ] [ 4 ] E.g., the integer 14 is a composite number because it is the product of the two smaller integers 2 × 7 but the integers 2 and 3 are not because each can only be divided by one and ...
The parity function maps a number to the number of 1's in its binary representation, modulo 2, so its value is zero for evil numbers and one for odious numbers. The Thue–Morse sequence , an infinite sequence of 0's and 1's, has a 0 in position i when i is evil, and a 1 in that position when i is odious.
Tố Hữu, whose real name is Nguyễn Kim Thành, was born 4 October 1920 in Hoi An, Quang Nam province, as the youngest son of the family.At the age of 9, Thành and his father returned home and lived in Phu Lai village, now in Quang Tho commune, Quang Dien district, Huế.