19587

Appears in sequences

• Smallest k for which k, 2k, ... nk all contain the digit 7.at n=6A039938
• Integers n > 10563 such that the 'Reverse and Add!' trajectory of n joins the trajectory of 10563.at n=13A063064
• Laguerre transform of the Jacobsthal numbers.at n=6A129695
• Integers k such that 10^k + 61 is a prime number.at n=15A135116
• 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, 1), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.at n=8A149675
• Numbers k such that, taken together, the base-10 and base-b expansions of k are pandigital for some b < 10.at n=7A174596
• Number of (w,x,y) with all terms in {0,...,n} and w<x+y and x<=y.at n=35A212982
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 934", based on the 5-celled von Neumann neighborhood.at n=38A273794
• Number of nX3 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors.at n=5A282991
• Number of nX6 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors.at n=2A282994
• T(n,k) is the number of n X k 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors.at n=30A282996
• T(n,k) is the number of n X k 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors.at n=33A282996
• A039938 with duplicates removed.at n=6A285846
• G.f. satisfies A(x) = exp( 3 * Sum_{k>=1} A(-x^k) * x^k/k ).at n=8A363471
• a(n) = Sum_{j=1..n} Sum_{k=1..n} tau(j*k).at n=40A372674
• a(n) is the smallest number which can be represented as the sum of four distinct nonzero n-gonal numbers in exactly n ways, or -1 if no such number exists.at n=16A374274