18369

Appears in sequences

• Numbers k that divide 7^k + 2^k.at n=35A045580
• Numbers k that divide 7^k + 5^k.at n=27A045596
• Row sums of triangle A049404.at n=8A049425
• Write 1, 2, 3, 4, ... counterclockwise in a hexagonal spiral around 0 starting left down, then a(n) is the sequence found by reading from 0 in the vertical upward direction.at n=39A063436
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={0}.at n=12A079997
• Numbers which are sums of two and also sums of three positive cubes.at n=34A085336
• Numbers which are sums of two, three and four cubes.at n=22A085337
• Numbers which are sums of two, three, four and also sums of five cubes.at n=21A085338
• Main diagonal of array A[k,n] = n-th sum of k consecutive k-gonal numbers, k>2.at n=10A130424
• 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), (-1, 1, -1), (1, 0, 0)}.at n=12A148006
• Sum of a positive square and a positive cube in at least three ways.at n=32A171385
• Number of (n+1)X(4+1) arrays of permutations of 0..n*5+4 filled by rows with each element moved a city block distance of 0 or 1, and rows and columns in increasing lexicographic order.at n=2A263515
• T(n,k) = Number of (n+1) X (k+1) arrays of permutations of 0..(n+1)*(k+1)-1 filled by rows with each element moved a city block distance of 0 or 1, and rows and columns in increasing lexicographic order.at n=17A263519
• Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 filled by rows with each element moved a city block distance of 0 or 1, and rows and columns in increasing lexicographic order.at n=3A263521
• Number of n X 4 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself.at n=18A266008
• Numbers that are, at the same time, the sum of: two positive squares, a positive square and a positive cube, and two positive cubes. In other words, intersection of A000404, A003325 and A055394.at n=35A273498
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f.: exp(Sum_{j=1..k+1} binomial(k,j-1)*x^j/j).at n=63A293991
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + n, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=16A294365
• Numbers k such that (5*10^k + 79)/3 is prime.at n=18A295033
• a(n) = Sum_{k=1..n} floor(n/k)^3.at n=24A318742