353220

Appears in sequences

• Smallest triangular number having n^2 as divisor.at n=28A080983
• a(n) = n^2 * (n^2 - 1)/2.at n=28A083374
• a(n) = ((n-th prime)^4-(n-th prime)^2)/2.at n=9A138418
• Triangular numbers that are sums of twin prime pairs.at n=26A165966
• Let T(n) = n(n+1)/2 be the n-th triangular number (A000217); a(n) = T(8T(n)).at n=14A185096
• a(n) = smaller member of n-th pair of distinct, positive, triangular numbers whose sum and difference are also triangular numbers.at n=21A185129
• Number of 2 X 2 matrices with all terms in {0,1,...,n} and odd trace.at n=28A210379
• Triangular numbers that are the product of a triangular number and a square number (both greater than 1).at n=14A253650
• Triangular numbers that are the product of a triangular number and an oblong number.at n=38A253652