منابع مشابه
Ulam Sequences and Ulam Sets
The Ulam sequence is given by a1 = 1, a2 = 2, and then, for n ≥ 3, the element an is defined as the smallest integer that can be written as the sum of two distinct earlier elements in a unique way. This gives the sequence 1, 2, 3, 4, 6, 8, 11, 13, 16, . . . , which has a mysterious quasi-periodic behavior that is not understood. Ulam’s definition naturally extends to higher dimensions: for a se...
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ژورنال
عنوان ژورنال: Nature
سال: 1989
ISSN: 0028-0836,1476-4687
DOI: 10.1038/342137b0