30248

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 19 ones.at n=26A031787
• Numerators of continued fraction convergents to sqrt(60).at n=9A041104
• Starts for strings of at least five consecutive nonsquarefree numbers.at n=18A078144
• a(n) = 8*a(n-1) - a(n-2), starting with a(0) = 2 and a(1) = 8.at n=5A086903
• 5th GegenbauerC polynomial evaluated at powers of 2 (multiplied by 5).at n=2A167440
• Sums of 4 distinct primorials.at n=21A177709
• a(1) = 2, a(n) = (n-th-even n^3) - (sum of previous terms).at n=36A181509
• Number of -3..3 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having three or four distinct values for every i<=n and j<=n.at n=4A211502
• The number of symmetric positive definite 2 X 2 matrices whose entries are integers of absolute value at most n.at n=31A219693
• a(n) = n^5 - 5*n^3 + 5*n.at n=7A230586
• Array T(n,k) read by antidiagonals: T(n,k) = sum(i=0...n, (-1)^(n+i) * C(n+i,2i) * n/(2i+1) * k^(2i+1) ), n>0, k>1.at n=34A231123
• Number of (n+1)X(2+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal.at n=4A237009
• Number of (n+1)X(5+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal.at n=1A237012
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal.at n=16A237015
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal.at n=19A237015
• G.f. satisfies: A(x - 3*A(x)^2) = x + A(x)^2.at n=4A276363
• Number of non-equivalent ways to tile an n X n X n triangular area with three 2 X 2 X 2 triangular tiles and an appropriate number (= n^2-12) of 1 X 1 X 1 tiles.at n=9A286445
• Numbers that are the sum of distinct primorial numbers (A002110) (not including 1).at n=42A290249
• Union_{odd primes p, n >= 3} {T_p(n)}, where T_m(x) = x*T_{m-1}(x) - T_{m-2}(x), m >= 2, T_0(x) = 2, T_1(x) = x (dilated Chebyshev polynomials of the first kind).at n=32A299071
• Numbers k such that k divides the number of overpartitions of k (A015128).at n=25A299961