Sequences

Numbers whose base-4 representation has the number of 0's, 2's and 3's.

Numbers whose base-4 representation has the same number of 1's, 2's and 3's.

Numbers whose base-5 representation has the same number of 0's, 1's and 2's.

Numbers whose base-5 representation has the same number of 0's, 1's and 3's.

Numbers whose base-5 representation has the same number of 0's, 1's and 4's.

Numbers whose base-5 representation has the same number of 0's, 2's and 3's.

Numbers whose base-5 representation has the same number of 0's, 2's and 4's.

Numbers whose base-5 representation has the same number of 0's, 3's and 4's.

Numbers whose base-5 representation has the same number of 1's, 2's and 3's.

Numbers whose base-5 representation has the same number of 1's, 2's and 4's.

Numbers whose base-5 representation has the same number of 1's, 3's and 4's.

Numbers whose base-5 representation has the same number of 2's, 3's and 4's.

Numbers whose base-6 representation has the same number of 0's, 1's and 2's.

Numbers whose base-6 representation has the same number of 0's, 1's and 3's.

Numbers whose base-6 representation has the same number of 0's, 1's and 4's.

Numbers whose base-6 representation has the same number of 0's, 1's and 5's.

Numbers whose base-6 representation has the same number of 0's, 2's and 3's.

Numbers whose base-6 representation has the same number of 0's, 2's and 4's.

Numbers whose base-6 representation has the same number of 0's, 2's and 5's.

Numbers whose base-6 representation has the same number of 0's, 3's and 4's.

Numbers whose base-6 representation has the same number of 0's, 3's and 5's.

Numbers whose base-6 representation has the same number of 0's, 4's and 5's.

Numbers whose base-6 representation has the same number of 1's, 2's and 3's.

Numbers whose base-6 representation has the same number of 1's, 2's and 4's.

Numbers whose base-6 representation has the same number of 1's, 2's and 5's.

Numbers whose base-6 representation has the same number of 1's, 3's and 4's.

Numbers whose base-6 representation has the same number of 1's, 3's and 5's.

Numbers whose base-6 representation has the same number of 1's, 4's and 5's.

Numbers whose base-6 representation has the same number of 2's, 3's and 4's.

Numbers whose base-6 representation has the same number of 2's, 3's and 5's.

Numbers whose base-6 representation has the same number of 2's, 4's and 5's.

Numbers whose base-6 representation has the same number of 3's, 4's and 5's.

Number of unitary divisors of central binomial coefficients.

Hexamorphic numbers: k such that the k-th hexagonal number ends with k.

Positive Fibonacci numbers that are also triangular numbers.

Numbers that are simultaneously triangular and square pyramidal.

Triangle read by rows: T(n,k) = number of 2 X inf arrays [ n, n1, n2, ...; k, k1, k2,... ] with n>=n1>n2>...>=0, k>=k1>k2...>=0, n>k, n1>k1, ...; n >= 1, k >= 0. Note that once ni or ki = 0, the strict inequalities become equalities (constant 0 thereafter).

Triangle formed from odd-numbered columns of triangle of expansions of powers of x in terms of Chebyshev polynomials U_n(x). Sometimes called Catalan's triangle.

Triangle formed from even-numbered columns of triangle of expansions of powers of x in terms of Chebyshev polynomials U_n(x).

Numbers whose base-12 representation has the same nonzero number of 0's and 8's.

Numbers whose base-12 representation has the same nonzero number of 0's and 9's.

Numbers whose base-12 representation has the same nonzero number of 0's and 10's.

Numbers whose base-12 representation has the same nonzero number of 0's and 11's.

Numbers whose base-12 representation has the same nonzero number of 1's and 2's.

Numbers whose base-12 representation has the same nonzero number of 1's and 3's.

Numbers whose base-12 representation has the same nonzero number of 1's and 4's.

Numbers whose base-12 representation has the same nonzero number of 1's and 5's.

Numbers whose base-12 representation has the same nonzero number of 1's and 6's.

Numbers whose base-12 representation has the same nonzero number of 1's and 7's.

Numbers whose base-12 representation has the same nonzero number of 1's and 8's.