21623

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 21.at n=6A031699
• Number of squares (of positive integers) with n digits.at n=8A049415
• Number of squares (including 0) with n digits.at n=8A062940
• Number of conjugacy classes in the symmetric group S_n with distinct cardinality.at n=44A073906
• Numbers k such that the number of prime divisors of the k-th Catalan number (counted with multiplicity) divides k.at n=38A121612
• 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, 0, 0), (-1, 0, 1), (1, 0, -1), (1, 1, 1)}.at n=8A149643
• a(n) = 441n^2 + 2n.at n=6A158321
• Number A(n,k) of n-digit k-th powers; square array A(n,k), n>=1, k>=1, read by antidiagonals.at n=53A216653
• One more than the partial sums of A219661.at n=8A219665
• Values x of successive minima records of k = log(x)/log(d) where d runs through the positive values of x^3-round(sqrt(x^3))^2.at n=14A232536
• Number of irreducible normal polynomials of degree n over GF(2) that are not primitive.at n=24A272033
• Coefficients in the odd function A(x) such that: A(x) = A( x^2 + 2*x^2*A(x)^2 )^(1/2), with A(0)=0, A'(0)=1.at n=9A356780
• Number of free polybends with n cells.at n=18A392389