18504

Appears in sequences

• a(0) = 1, a(n) = 22*n^2 + 2 for n>0.at n=29A010012
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 34.at n=7A031712
• Related to enumeration of edge-rooted catafusenes.at n=15A039660
• Numerators of continued fraction convergents to sqrt(579).at n=2A042108
• When expressed in base 3 and then interpreted in base 8, is a multiple of the original number.at n=44A062889
• The (2^n)-th composite number.at n=14A065856
• Numbers k such that 3*k! - 1 is prime.at n=16A076134
• Starting positions of strings of three 6's in the decimal expansion of Pi.at n=12A083625
• Triangle, read by rows, such that the diagonal (A084785) is the self-convolution of the first column (A084784) and the row sums (A084786) gives the differences of the diagonal and the first column.at n=35A084783
• Diagonal of the triangle (A084783) and the self-convolution of the first column (A084784).at n=7A084785
• Antidiagonal sums of triangle A107105: a(n) = Sum_{k=0..n} A107105(n-k,k), where A107105(n,k) = C(n,k)*(C(n,k) + 1)/2.at n=13A107597
• Numbers that have exactly six prime factors counted with multiplicity (A046306) whose digit reversal is different and also has 6 prime factors (with multiplicity).at n=22A109026
• Row sums of triangle A123610.at n=10A123611
• The Wiener index of a chain of n squares joined at vertices (i.e., joined like <><><>...<>; here <> is a square!).at n=17A143943
• a(n) = 64*n^2 + 8.at n=16A158488
• Difference A063990(2n)-A063990(2n-1) between amicable numbers.at n=38A178542
• a(n) = 2*n*(7*n + 5).at n=36A195027
• Number of orthogonal rectangles with vertices on an n X n square grid of points but with no vertices on the grid's diagonals.at n=19A285956
• Let a(0)=1. Then a(n) = sums of consecutive strings of positive integers of length 3*n, starting with the integer 2.at n=16A289721