19651

Appears in sequences

• a(n+1) = a(n) converted to base 7 from base 5 (written in base 10).at n=13A023380
• Numbers whose base-4 representation contains exactly four 0's and three 3's.at n=28A045084
• Numbers k such that phi(k)+sigma(k) is a perfect cube.at n=11A061366
• a(n) = 8*n^4 + 9*n^2 + 2.at n=7A083196
• Number of isomorphism classes of linking pairings on finite Abelian 2-groups of fixed order 2^n.at n=21A122555
• a(n) = 68*n^2 - 1.at n=16A158730
• Antidiagonal sums of the Wythoff array A035513.at n=15A160997
• a(n) = (4*n^3 - 6*n^2 + 8*n + 3)/3.at n=25A161712
• a(n) = 25*n^2 + 15*n + 1021.at n=27A214732
• Absolute discriminants of complex quadratic fields with 3-class rank 2.at n=19A242862
• Absolute discriminants of complex quadratic fields with 3-class group of elementary abelian type (3,3) of rank 2.at n=12A242863
• Absolute discriminants of complex quadratic fields with 3-class group of type (3,3) and Hilbert 3-class field tower of exact length 2.at n=4A242864
• Absolute discriminants of complex quadratic fields with 3-class group of type (3,3) and 3-principalization type (2241).at n=2A247689
• Absolute discriminants of complex quadratic fields with 3-class group of type (3,3) whose second 3-class group is located on the sporadic part of the coclass graph G(3,2) outside of coclass trees.at n=7A247691
• a(n) = 2*a(n-1) + 2*a(n-2) - a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.at n=12A298416
• Numbers k at which the ratio A288814(k) / k reaches a record high.at n=45A301592
• Array read by antidiagonals: T(m,n) = number of total dominating sets in the n X m king graph.at n=23A303114
• Array read by antidiagonals: T(m,n) = number of total dominating sets in the n X m king graph.at n=25A303114
• a(n) = 17*n^2 - 1.at n=34A321180