18716

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite BRE = Brewsterite (Sr,Ba)2[Al4Si12O32].10H2O starting with a T4 atom.at n=13A019085
• Numbers having four 4's in base 8.at n=15A043440
• Numbers n such that sigma(n) and d(n) are both harmonic (Ore) numbers.at n=8A071767
• Pseudo-random numbers: MS C 6.0 version.at n=27A084275
• Numbers k that divide the sum of digits of 13^k.at n=38A175525
• Number of line segments connecting exactly 8 points in an n x n grid of points.at n=40A177724
• Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.at n=8A260836
• Number of connected undirected unlabeled loopless multigraphs with 4 vertices and n edges.at n=32A290778
• Expansion of 1/(1 - Sum_{k>=1} lambda(k)*x^k), where lambda() is the Liouville function (A008836).at n=38A307076
• Numbers k such that the abundancy index of sigma(k) divided by the abundancy index of d(k) equals a whole number.at n=14A392507