25195

Appears in sequences

• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 11 (most significant digit on right).at n=18A029504
• Total sum of minimum block sizes in all partitions of n-set.at n=8A097147
• Linear recurrence a(n) = a(n-3) + 2a(n-5), starting from all-one initial conditions.at n=41A133683
• Row sums of triangle A137712.at n=21A137713
• Row sums of A138060.at n=28A138289
• Integers n such that 6n, 36n, and 216n fall between pairs of twin primes, that is, 6n-1, 6n+1, 36n-1, 36n+1, 216n-1, and 216n+1 are prime.at n=15A192851
• Number of n X 2 binary arrays indicating whether each 2 X 2 subblock of a larger binary array has lexicographically nondecreasing rows and columns, for some larger (n+1) X 3 binary array with rows and columns of the latter in lexicographically nondecreasing order.at n=17A227252
• Number T(n,k) of entries in the k-th blocks of all set partitions of [n] when blocks are ordered by increasing lengths (and increasing smallest elements); triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=36A319298