66300

Appears in sequences

• Triangle read by rows: T(n,k) is the number of Schroeder paths of length 2n having exactly k down steps hitting the x-axis.at n=47A101275
• a(0)=1, a(n) = (3n-1)*3n*(3n+1)/2 for n>0.at n=17A157024
• a(n) = 3*(9*n - 1)*(3*n - 2).at n=29A277985
• Positive integers that have a record number of divisors in Gaussian integers.at n=39A279254
• Least k > 1 such that all divisors of (k^n-1)/(k-1) are == 1 (mod n).at n=51A298076
• a(n) = 2n*(n+1)*(2n+1).at n=25A300758
• a(n) = Product_{d|n, d>1} prime(A304101(d)-1).at n=53A304104
• Numbers that set a record for occurrences as longest side of a triangle with integer sides and positive integer area.at n=46A322105
• Numbers k such that 451*2^k+1 is prime.at n=6A323195
• Number of integer partitions of n such that every orderless pair of distinct parts has a different sum.at n=49A325857
• a(n) = n * sigma_2(n).at n=38A328259