20768

Appears in sequences

• Least term in period of continued fraction for sqrt(n) is 9.at n=18A031433
• Group successively larger composite numbers so that the sum of the n-th group is a multiple of n. Sequence gives the sum of the terms in the n-th group.at n=31A074120
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.at n=10A148268
• Expansion of (1+4*x+14*x^2)/(1-2*x^2-64*x^3).at n=7A158784
• a(n) = 81*n^2 + 2*n.at n=15A177099
• Number of partitions of n such that (greatest part) + (least part) <= number of parts.at n=40A237823
• Value of concatenation of all suffixes of binary representation of n.at n=20A241426
• Numbers n such that n!3 + 3^6 is prime.at n=29A247467
• a(n) is the largest number that can be expressed as the sum of three triangular numbers in exactly n ways.at n=14A330810
• a(n) is the largest number that can be expressed as the sum of three positive triangular numbers in exactly n ways.at n=15A330811
• a(n) = Sum_{i|n, j|n, k|n} i*j*k/lcm(i,j,k).at n=39A344135
• a(n) = number of primes < n^4.at n=22A380331