18010

Appears in sequences

• Octahedral numbers: a(n) = n*(2*n^2 + 1)/3.at n=30A005900
• Numbers k such that the square of k contains sigma(k) as a substring, in base 10.at n=10A113654
• a(n) = Least i in range [A165598(n),A165598(n+1)] for which abs(A165597(i)) gets the maximum value in that range.at n=30A165599
• Number of 7 X n arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..1 7 X n array.at n=13A220037
• Number of conjugacy classes of the symmetric group S_n when conjugating only by even permutations.at n=35A242101
• Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=33A254904
• Numbers n such that the decimal digits of n-phi(n) are a permutation of those of n.at n=34A273799
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 150", based on the 5-celled von Neumann neighborhood.at n=28A286088
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 150", based on the 5-celled von Neumann neighborhood.at n=29A286088
• Numbers k such that the coefficient of x^k in the expansion of Product_{j>=1} (1 - x^j)^5 is zero.at n=24A302057
• Numbers k such that A006577(k^2) sets a new record.at n=26A346592
• Partial sums of the even triangular numbers (A014494).at n=29A352115
• Number of integer partitions of n such that, for all parts x of multiplicity 1, either x - 1 or x + 1 is also a part.at n=45A355393