19192

Appears in sequences

• Expansion of Product_{m>=1} (1 - m*q^m)^4.at n=19A022664
• Sum of staircase twin primes according to the rule: top * bottom + next top.at n=10A135286
• Numbers k such that the digit sum of 167^k is divisible by k.at n=34A175552
• Number of (n+1) X 3 binary arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.at n=16A186455
• Coefficient of x^2 in the reduction of the n-th Fibonacci polynomial by x^3->x^2+3x+1.at n=12A192779
• Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and determinant n.at n=34A211140
• Numbers n such that gcd(n, phi(n)) = gcd(phi(n), sigma(n)) = gcd(sigma(n), n) = tau(n).at n=33A217301
• Number of (7+2)X(n+2) 0..4 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=7A252968
• a(n) = prime(n)*prime(n+1) + prime(n+2).at n=32A292926
• Number of tree-partitions of a multiset whose multiplicities are the prime indices of n.at n=48A318847
• a(n) = A002070(n) + A036689(n).at n=33A366346