20890

Appears in sequences

• Conjectured dimensions of spaces of weight systems of chord diagrams.at n=19A014595
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MEP = Melanophlogite [Si46O92].qR starting with a T2 atom.at n=13A019156
• Numbers whose base-12 representation has exactly 5 runs.at n=9A043654
• Indices of primes in sequence defined by A(0) = 79, A(k) = 10*A(k-1) - 81 for k > 0.at n=29A101130
• Expansion of g.f. x*(1 - x)*(1 + x)/((x^2 + 3*x + 1)*(x^2 - 4*x + 1)).at n=9A171067
• Number of 6-cycles in the n X n king graph.at n=14A288920
• Numbers n such that prime(n) contains a substring of all the prime digits in order, i.e., "2357".at n=11A295708