27649

Appears in sequences

• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 19 (most significant digit on right).at n=29A029512
• a(n) = 2*n^3 + 1.at n=24A033562
• Composite and every divisor (except 1) contains the digit 4.at n=20A062670
• Composite numbers of the form 1^1 * 2^2 * 3^3 * 4^4 * ... * n^n + 1.at n=0A079321
• Expansion of -(x+2*x^2+3*x^3-1+5*x^4)/((x+1)*(x^2-3*x+1)*(1+x^2)).at n=14A109786
• Pierpont semiprimes: semiprimes of the form (2^K)*(3^L)+1.at n=35A113432
• Semiprimes in A056107.at n=25A113525
• Expansion of Product_{k > 0} (1 + A147665(k)*x^k).at n=31A147871
• a(n) = 48*n^2 + 1.at n=24A158638
• Number of (n+2) X 3 binary arrays avoiding patterns 001 and 100 in rows, columns and nw-to-se diagonals.at n=5A202584
• Number of (n+2)X8 binary arrays avoiding patterns 001 and 100 in rows, columns and nw-to-se diagonals.at n=0A202589
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 001 and 100 in rows, columns and nw-to-se diagonals.at n=15A202591
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 001 and 100 in rows, columns and nw-to-se diagonals.at n=20A202591
• MM-numbers of crossing, capturing multiset partitions (with empty parts allowed).at n=11A326259
• Integers which can be written in exactly three ways as sum of two distinct nonzero pentagonal numbers.at n=35A333013
• a(n) = (n!)^2 * Sum_{k=0..n} (-1)^(n-k) * (k+1) / ((n-k)!)^2.at n=5A337151
• Numerators of the partial sums of the reciprocals of the unitary totient function (A047994).at n=21A379517