27224

Appears in sequences

• Engel expansion of sinh(1/2).at n=41A068379
• Numbers k that have no zero digits and such that both k+1 and (product of digits of k) + 1 are squares.at n=19A081990
• a(n) = Sum_{prime p <= n} n!/p!.at n=6A110378
• Numbers k such that k and k^2 use only the digits 1, 2, 4, 6 and 7.at n=31A136993
• a(n) = 4*(3*n+1)*(3*n+2).at n=27A144410
• 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, 1, -1), (1, 0, 0)}.at n=11A148508
• 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, 0), (1, 0, -1), (1, 1, 0)}.at n=9A149156
• Number of square involutions of n.at n=13A164990
• Record numbers of A171063 nonzero period n solutions of x(i)=(x(i-1)+x(i-2)) mod m, as encountered in (n=1,m=1; n=1,m=2; n=2,m=1) antidiagonal order.at n=21A171061
• Record numbers of A171063 nonzero period n solutions of x(i)=(x(i-1)+x(i-2)) mod m, as encountered in (n=1,m=1; n=2,m=1; n=1,m=2) antidiagonal order.at n=22A171062
• T(n,k)=Number of side-n hexagonal 0..k arrays with values nondecreasing E, SW and SE.at n=27A216937
• Number of side-7 hexagonal 0..n arrays with values nondecreasing E, SW and SE.at n=0A216943
• Sum of largest parts of all partitions of n into an odd number of parts.at n=30A222047
• Numbers decremented by their digit product produce a cube.at n=39A229184
• Triangle read by rows: T(n,k) is the number of non-equivalent regular polygons with n+1 edges, one of which is rooted, which are dissected by non-intersecting diagonals into k regions, such that two such polygons are identified up to reflection along the rooted edge and twisting along the diagonals that does not affect the root edge (for 1 <= k <= n-1 and n >= 2).at n=70A232206
• Numbers n such that n!3 + 3^8 is prime, where n!3 = n!!! is a triple factorial number (A007661).at n=32A264867
• Number of canonical forms for separation coordinates on hyperspheres S_n, ordered by increasing number of independent continuous parameters.at n=73A295380
• a(n) = (n!)^2 * Sum_{k=0..n-1} (-1)^k / ((n-k) * k!)^2.at n=7A346411
• a(n) is the index where A387090(n) appears in A386482.at n=28A386484