165600

Appears in sequences

• 1 / min{1/n - 1/a - 1/b > 0}, where a and b are integers.at n=22A045470
• a(n) = n^2 * (n^2 - 1)/2.at n=23A083374
• Triangular numbers which are 10-almost primes.at n=3A101744
• Triangular numbers whose digit reversal is a powerful(1) number (A001694).at n=5A115692
• Triangular numbers whose reverse is a square (possibly with fewer digits).at n=4A179889
• a(n) = 1*3*5 + 3*5*7 + 5*7*9 + ... (n terms).at n=16A196506
• Row sums of the triangle A045975.at n=23A204558
• Number of 2 X 2 matrices with all elements in {0,1,...,n} and positive odd determinant.at n=30A210373
• Positive numbers m such that m^2 - 1 divides 2^m - 1.at n=24A247219
• Triangular numbers that are the product of a triangular number and an oblong number.at n=30A253652
• 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=19A255917
• Positive numbers m such that m^2 - 1 divides 4^m - 1.at n=42A271842
• Positions of records in A344590.at n=12A344588
• a(n) = Sum_{k=0..n} binomial(k+6,6) * binomial(2*k,2*n-2*k).at n=7A382473