20337

Appears in sequences

• Least k such that the first k terms of A006928 contain n more 2's than 1's.at n=10A025507
• Floor( e * (3/2)^n ).at n=22A081225
• Starting positions of strings of three 8's in the decimal expansion of Pi.at n=16A083637
• Numbers whose square root in base 10 starts with 10 distinct digits.at n=10A113507
• Semiprimes in A056109.at n=38A113528
• Numbers k such that binomial(5k, k) + 1 is prime.at n=14A125243
• Number of species of separated Latin bi-trades of size n.at n=16A133164
• 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, 0), (-1, 0, -1), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.at n=9A148930
• Triangle T_3(n, m), the number of surjective multi-valued functions from {1, 1, 1, 2, 3, ..., n-2} to {1, 2, 3, ..., m} by rows (n >= 1, 1 <= m <= n).at n=47A172107
• Indices in A006928 where the imbalance between 1's and 2's sets a new record.at n=23A274775
• Numbers of the form HMMSS with primes H < 24 and MM, SS < 60, for which the number of seconds after midnight, 3600*H+60*MM+SS, is also prime.at n=6A295011
• Prime time numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60.at n=28A295014
• Partitions into parts with frequency less than or equal to their place in the list of summands.at n=51A295261
• Numbers n such that there is precisely 1 group of order n, 2 of order n + 1 and 3 of order n + 2.at n=13A296024
• a(n) = 27*n^2/2 + 45*n/2 - 12 (n>=1).at n=37A304375
• Number of intersection points formed by drawing all least squares regression lines fitted to n points (j,y_j), 0 <= j < n, where each y_j is 0 or 1.at n=10A371437
• Expansion of Product_{i>=1, j>=0} (1 + x^(i * 6^j)).at n=58A373220
• a(n) = 12*n^2 + 4*n + 1.at n=41A381390
• Square array A(n,k), n>=0, k>=0, read by antidiagonals downwards, where column k is the expansion of 1/(1 - k*x) * Product_{j=0..k-1} (1 + j*x)/(1 - j*x).at n=62A383818
• Expansion of (1+x) * (1+2*x)/((1-x) * (1-2*x) * (1-3*x)).at n=7A383912