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Cyclic Compositions of a Positive Integer with Parts Avoiding an Arithmetic Sequence

机译:部分避免算术序列的正整数的循环组成

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A linear composition of a positive integer n is a finite sequence of positive integers (called parts) whose sum equals n. A cyclic composition of n is an equivalent class of all linear compositions of n that can be obtained from each other by a cyclic shift. In this paper, we enumerate the cyclic compositions of n that avoid an increasing arithmetic sequence of positive integers. In the case where all multiples of a positive integer r are avoided, we show that the number of cyclic compositions of n with this property equals to or is one less than the number of cyclic zero-one sequences of length n that do not contain r consecutive ones. In addition, we show that this number is related to the r-step Lucas numbers.
机译:正整数n的线性组成是和等于n的正整数(称为部分)的有限序列。 n的循环组成是n的所有线性组成的等效类,它们可以通过循环移位相互获得。在本文中,我们列举了n的循环组成,这些循环组成避免了正整数的递增算术序列。在避免正整数r的所有整数倍的情况下,我们证明具有此属性的n的循环组成数等于或小于不包含r的长度为n的循环零一序列的数目连续的。此外,我们表明该数字与r阶卢卡斯数字有关。

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