248160

Appears in sequences

• Triangular numbers which are 9-almost primes.at n=3A076583
• Permutation of natural numbers: a(1) = 1; a(2n) = nontriangular(a(n)), a(2n+1) = triangular(1+a(n)), where triangular = A000217, nontriangular = A014132.at n=70A257798
• a(n) = A000217(A000217(n)+1).at n=37A267707
• Refactorable triangular numbers.at n=30A272524