140547

Appears in sequences

• a(n) = k such that the k-th triangular number is A068808(n).at n=30A067991
• Index of the smallest triangular number with digit sum = n-th triangular number.at n=12A068134
• Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 2.at n=19A238913