145530

Appears in sequences

• Triangular numbers which are 8-almost primes.at n=15A076582
• Smallest triangular number divisible by exactly n triangular numbers.at n=17A076983
• Row sums of triangle A093922.at n=33A093925
• Triangular numbers which are the sum of distinct double factorials (A006882).at n=34A115650
• Triangular numbers for which the sum of the digits equals the sum of the digits of the next triangular number.at n=26A117511
• Triangle of bifactorial numbers, n B m = (2(n-m)-1)!! (2(n-1))!! / (2(n-m))!!, read by rows.at n=29A122774
• Triangular numbers that are the product of two triangular numbers greater than 1.at n=31A188630
• Triangular numbers, T(m), that are three-halves of another triangular number; T(m) such that 2*T(m) = 3*T(k) for some k.at n=3A200994
• Triangular numbers that are the product of three distinct triangular numbers greater than 1.at n=22A225440
• Triangular numbers that are the product of 4 distinct triangular numbers greater than 1.at n=2A226501
• Triangular numbers that are the product of a triangular number and an oblong number.at n=29A253652
• Triangular numbers n such that each decimal digit of n is equal to the difference of at least two other digits of n.at n=17A255917
• a(1) = 1. For n > 1, a(n) = a(n-1)/2 if a(n-1) is even, a(n) = a(n-1)*n otherwise.at n=21A290650
• 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=13A295768
• Triangular numbers that can be represented as a product of two triangular numbers greater than 1, and as a product of three triangular numbers greater than 1.at n=11A295769
• Triangular numbers that can be represented as a product of two triangular numbers greater than 1, as a product of three triangular numbers greater than 1, and as a product of four triangular numbers greater than 1.at n=2A296097
• Numbers that are product of a hexagonal number (A000384) and a square pyramidal numbers (A000330) in at least two ways.at n=25A306121
• Numbers that are product of a second hexagonal number (A014105) and a square pyramidal numbers (A000330) in at least two ways.at n=19A306122
• a(n) = Product_{d|n, d>1} prime(A318881(d)), where A318881(d) records the prime signature of A000010(d).at n=35A319344
• Triangle read by rows where T(n,k) is the number of labeled loop-graphs on n vertices with k loops and n-k non-loops such that it is possible to choose a different vertex from each edge.at n=40A368924