172201

Appears in sequences

• Number of skew shapes in a 3 X n rectangle with no empty rows or columns.at n=35A362153
• Indices k at which either the leading digit or the length of A121805(k) changes.at n=48A367358
• a(n) is the least number k whose digit sums are 2*n-1, 2*n and 2*n+1 in bases 2*n-1, 2*n and 2*n+1 respectively.at n=19A379896