20782

Appears in sequences

• Numbers whose least quadratic nonresidue (A020649) is 19.at n=7A025027
• Numbers k such that k*2^m-1 are composites for all exponents m in the range 0<=m<=k.at n=38A061154
• Number of base-2 palindromic primes (A016041) in range [2^2n,2^(2n+1)].at n=17A095741
• Number of palindromic primes in base 2 with exactly n binary digits.at n=36A117773
• Table which contains in row n the mapping of the n-th block of 4 primes to 4 integers.at n=26A162156
• Number of strings of numbers x(i=1..n) in 0..3 with sum i^2*x(i)^3 equal to n^2*27.at n=13A184312
• Sum of all odd-indexed parts minus the sum of all even-indexed parts of all partitions of n, with the parts written in nondecreasing order.at n=39A194714
• Number of (n+1) X (n+1) 0..1 arrays with no 2 X 2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements.at n=2A251220
• Number of (n+1)X(3+1) 0..1 arrays with no 2X2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements.at n=2A251223
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with no 2X2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements.at n=12A251228
• Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 8.at n=4A252327
• Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 8.at n=0A252331
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 8.at n=10A252334
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 8.at n=14A252334
• Number of distinct digital types of n-digit primes in base 10.at n=8A267013
• Absolute value of alternating row sum of row 2n in A238498.at n=8A272178
• Number of nX4 0..1 arrays with each 1 adjacent to 0, 1 or 3 king-move neighboring 1s.at n=4A296647
• Number of nX5 0..1 arrays with each 1 adjacent to 0, 1 or 3 king-move neighboring 1s.at n=3A296648
• T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 0, 1 or 3 king-move neighboring 1s.at n=31A296651
• T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 0, 1 or 3 king-move neighboring 1s.at n=32A296651