131580

Appears in sequences

• Least k such that k-1 and k+1 in binary representation have same number n of 0's as 1's.at n=7A191296
• a(n) = n*(n + 1)*(n + 2)*(n + 3)*(n^2 - n + 5)/120.at n=14A256860
• Numbers equal to the sum of the aliquot parts of the previous k numbers, for some k.at n=23A320021
• Number of n-tuples of 4 elements excluding reverse duplicates and those consisting of repetitions of the same element only.at n=9A321579