60129

Appears in sequences

• a(n) is the sum of squares of the first n positive integers congruent to 2 mod 3.at n=26A024394
• a(n) = diagonal sum of left-justified array T given by A027052.at n=31A027069
• Primefree centuries (i.e., numbers k such that no prime exists between 100*k and 100*k+99).at n=10A181098
• Number of 6X2 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 6 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=23A192706