全部/知识/近期新增OEIS · 近期新增6小时前更新HISTORY近 30 天历史柱高表示当天去重热搜数量‹›←→最新0030040050060070080090100110120130140150160170180190200210220230240250260273328242944305031300108/03—09/01 有历史数据01a(n) is the maximum cardinality of a Sidon subset of the set of positive divisors of n.近期新增顺序：1 · 编号：A398434 · 数列：1, 2, 2, 3, 2, 3, 2, 4, 3, 4, 2, 4, …（另有 76 项） · 关键词：nonn, new · 修订版本：5_Felix Huber_, Aug 25 202602a(n) is the number of collisions among unordered pairwise sums of positive divisors of n.近期新增顺序：2 · 编号：A398435 · 数列：0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 5, …（另有 74 项） · 关键词：nonn, easy, new · 修订版本：5_Felix Huber_, Aug 25 202603a(n) is the maximum number of unordered representations of an integer as a sum of two positive divisors of n.近期新增顺序：3 · 编号：A398577 · 数列：1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, …（另有 76 项） · 关键词：nonn, easy, new · 修订版本：8_Felix Huber_, Aug 24 202604Numbers k such that the set of positive divisors of k is not a Sidon set, but the set of positive divisors of every proper divisor of k is a Sidon set.近期新增顺序：4 · 编号：A398433 · 数列：6, 15, 20, 28, 63, 70, 88, 91, 99, 110, 130, 153, …（另有 43 项） · 关键词：nonn, new · 修订版本：9_Felix Huber_, Aug 24 202605Integers that are both pseudoperfect and pseudo-antiperfect.近期新增顺序：5 · 编号：A399140 · 数列：56, 60, 72, 88, 102, 104, 108, 112, 138, 144, 150, 162, …（另有 41 项） · 关键词：nonn, new · 修订版本：8_Paolo P. Lava_, Aug 20 202606Number of 4-dimensional vector partitions of (n, n, n, n) into parts with nonnegative components (not all zero).近期新增顺序：6 · 编号：A397811 · 数列：1, 15, 712, 27036, 911838, 26908756, 715574528, 17350394989, 388512622159, 8108712034249, 158972689341224, 2946100003644737, …（另有 6 项） · 关键词：nonn, new · 修订版本：32_Jishnu Babu Ranitha_, Aug 25 202607a(n) is the number of trees with n unlabeled vertices with at most two peripheral vertices.近期新增顺序：7 · 编号：A399148 · 数列：1, 1, 1, 1, 1, 2, 3, 6, 11, 24, 51, 118, …（另有 24 项） · 关键词：nonn, new · 修订版本：38_Gordon Hamilton_, Aug 20 202608Number of permutations pi of [n] such that LIS(pi)*LDS(pi) = n, where LIS and LDS are the lengths of the longest increasing and decreasing subsequences.近期新增顺序：8 · 编号：A399124 · 数列：1, 2, 2, 6, 2, 52, 2, 394, 1766, 3530, 2, 461738, …（另有 17 项） · 关键词：nonn, new · 修订版本：25_Alper Ferudun_, Aug 19 202609The sequence of binary decisions that defines the lexicographically earliest infinite path in the base-10 comma child graph.近期新增顺序：9 · 编号：A399179 · 数列：0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, …（另有 18 项） · 关键词：nonn, base, more, new · 修订版本：11_Michael S. Branicky_ and _N. J. A. Sloane_, Aug 31 202610Number of strict triangular plane partitions of n.近期新增顺序：10 · 编号：A399486 · 数列：1, 1, 1, 1, 1, 1, 3, 3, 5, 7, 9, 11, …（另有 43 项） · 关键词：nonn, nice, easy, new · 修订版本：8_John Tyler Rascoe_, Aug 29 2026
