20154

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 YUG = Yugawaralite Ca2[Al4Si12O32].8H2O starting from a T2 atom.at n=13A019265
• Numbers k such that the decimal part of k^(1/8) starts with a 'nine digits' anagram.at n=8A034283
• Position of first repeat of the opening sequence of length n occurring after the first repeat of the opening sequence of length n-1 in the Kolakoski sequence (A000002).at n=35A074300
• Numbers k such that the quotient (sigma(k) + sigma(k+1) + sigma(k+2))/sigma(3*k+3) is an integer.at n=2A091292
• Number of base 30 n-digit numbers with adjacent digits differing by one or less.at n=7A126384
• Number of n X 7 binary arrays without the pattern 0 1 diagonally, vertically or antidiagonally.at n=28A188864
• G.f. A(x) satisfies: A( x - A(x)^3 ) = x+x^3 - A(x)^3.at n=6A216171
• Number of partitions p of n such that median(p) = multiplicity(min(p)).at n=52A240214
• a(n) begins the first run of least n consecutive numbers whose sum of divisors has the same set of distinct prime divisors.at n=4A303693
• Numbers m such that sigma(m) = tau(m)! where sigma(k) = A000203(k) and tau(k) = A000005(k).at n=3A351866