1493856

Appears in sequences

• a(0) = 1; for n > 0, a(n) is the smallest triangular number which is a (proper) multiple of a(n-1).at n=5A068776
• a(n) = (n^6 + n^3)/2.at n=12A071232
• Highly composite triangular numbers: triangular numbers where the number of divisors increases to a record.at n=18A076711
• a(n) = sum of numbers from 1 to pi(n), where pi(n) = A007955(n).at n=11A184390
• Triangular numbers which have one or more occurrences of exactly seven different digits.at n=18A241790
• Triangular numbers that can be represented as a sum of two distinct triangular numbers, and as a product of two triangular numbers greater than 1.at n=30A295768
• Triangular numbers t(n) with a zeroless decimal representation such that (product of decimal digits of t(n)) / n is an integer.at n=9A307812