19569

Appears in sequences

• 2nd elementary symmetric function of first n+1 positive integers congruent to 1 mod 3.at n=10A024212
• Numbers k such that k^2 contains exactly 9 different digits.at n=34A054037
• Numbers whose square is a zeroless pandigital number (i.e., use the digits 1 through 9 once).at n=9A071519
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.at n=16A147031
• a(n) = A168174(n)-10^12.at n=23A168248
• Numbers k for which 5*k-4, 5*k-2, 5*k+2, and 5*k+4 are primes.at n=35A178082
• Number of (n+2)X4 binary arrays with no more than one of any consecutive three bits set in any row or column.at n=4A202415
• Number of (n+2)X7 binary arrays with no more than one of any consecutive three bits set in any row or column.at n=1A202418
• T(n,k) = Number of (n+2) X (k+2) binary arrays with no more than one of any consecutive three bits set in any row or column.at n=16A202421
• T(n,k) = Number of (n+2) X (k+2) binary arrays with no more than one of any consecutive three bits set in any row or column.at n=19A202421
• Number of all possible tetrahedra of any size, having reverse orientation to the original regular tetrahedron, formed when intersecting the latter by planes parallel to its sides and dividing its edges into n equal parts.at n=33A216172
• a(n) = n*(n^2 + 3*n - 2)/2.at n=33A256857
• Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or northwest neighbor modulo 3 and the upper left element equal to 0.at n=10A266833
• Numbers whose square contains all of the digits 1 through 9.at n=9A294661
• a(n) = Sum_{k=0..n} binomial(k, 7*(n-k)).at n=18A306721
• a(n) = Sum_{k=1..n} gcd(k,n)^(n/gcd(k,n) - 1).at n=23A342437
• Number of branching factorizations of the least integer of each prime signature (A025487).at n=30A366884
• Numbers k such that any two consecutive decimal digits of k^2 differ by 1 after arranging the digits in decreasing order.at n=42A370362
• a(n) = Sum_{k=0..floor(4*n/7)} binomial(k+2,4*n-7*k).at n=28A390219