Ulam number
- 乌拉姆数列（乌拉姆数列由乌拉姆在1964年提出。数列的首两项为1和2，对于n>2，Un为最小能以一种方法表达成之前两个相异项的和。例如3=1+2，故U3=3；4=1+3，故U4=4；5=2+3=1+4，不在数列内）
Ulam number
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abstract:
An Ulam number is a member of an integer sequence devised by and named after Stanislaw Ulam, who introduced it in 1964.. The standard Ulam sequence (the (1, 2)-Ulam sequence) starts with U1 = 1 and U2 = 2.
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WordNet