18724

Appears in sequences

• a(n) = floor(2^(n+2)/7).at n=14A033138
• Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,2.at n=7A037497
• Numbers that are repdigits in base 8.at n=32A048333
• a(n) equals floor(Vc(n) - Vs(n)), where Vc(n) is the volume of the cube with side length n and Vs(n) is the volume of the sphere of diameter n.at n=33A057671
• Numbers k such that k divides the (right) concatenation of all numbers <= k written in base 19 (most significant digit on right).at n=23A061948
• Number of subsets of {1,2,3,...,n} that sum to 0 mod 7.at n=17A068013
• Expansion of (1-x)/(1 - x - x^2 - 2*x^3).at n=16A078010
• Numerators of coefficients in expansion of x^-2*(1-exp(-2*x))^2.at n=14A104042
• a(n) = (8^n - 1)*4/7.at n=5A108019
• Numbers j such that (3^j)*(47#) -1 is prime.at n=40A110116
• Numbers whose natural logarithm, in base 10, starts with 10 distinct digits.at n=6A113509
• Expansion of f(q)*f(q^7)/(f(-q)*f(-q^7)) in powers of q where f() is a Ramanujan theta function.at n=37A123862
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+233)^2 = y^2.at n=8A129625
• Number of hierarchical ordered partitions of partitions.at n=13A141199
• a(n) + a(n+1) + a(n+2) = 2^n.at n=16A152732
• A023001 interleaved with 2*A023001 and 4*A023001.at n=17A155803
• Second edge diagonal of table A176577. (The first edge diagonal is A099627).at n=39A176575
• Numbers n with property that (n+1)*prime(n+1)-n*prime(n) is a perfect square s^2.at n=33A181283
• Floor(1/{(7+n^4)^(1/4)}), where {}=fractional part.at n=31A184631
• The left-hand half-triangle of A185356 (or A202690).at n=30A202816