22366

Appears in sequences

• Number of unrooted quartic trees with 2n (unlabeled) nodes and possessing a bicentroid; number of 2n-carbon alkanes C(2n)H(4n+2) with a bicentroid, ignoring stereoisomers.at n=8A010373
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite NES = NU-87 H4[Al4Si64O136].nH2O starting with a T5 atom.at n=13A019206
• Even triangular numbers with prime indices.at n=24A034955
• Smallest triangular numbers that contain the digits of n anywhere in their middle.at n=23A062829
• Triangular numbers composed of digits {2,3,6}.at n=5A119154
• Hexagonal numbers (A000384) which are sum of 2 other hexagonal numbers > 0.at n=19A133215
• Triangular numbers n*(n+1)/2 with n prime and n+1 nonprime.at n=45A144519
• Triangular numbers with digits in nondecreasing order.at n=23A234848
• Triangular numbers A000217 composed of only curved digits {0, 2, 3, 5, 6, 8, 9}.at n=37A247016
• Indices of pentagonal numbers (A000326) which are also centered pentagonal numbers (A005891).at n=5A253654
• Concatenation of n-th prime and n-th nonprime.at n=47A253910
• a(n) = A000217(A000217(n)+1).at n=20A267707
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 173", based on the 5-celled von Neumann neighborhood.at n=31A270467
• The intersection of hexagonal numbers (A000384) and centered 9-gonal numbers (A060544).at n=35A272399
• The first of three consecutive hexagonal numbers the sum of which is equal to the sum of three consecutive primes.at n=6A298272
• Positions of terms > 1 in A205007, or equally, where A205006(n) != n.at n=56A318894
• Numbers m such that m | A000385(m-1) = Sum_{k=1..m-1} sigma(k) * sigma(m-k).at n=23A326608
• a(n) = (m(n)^2 + 3)*(m(n)^2 + 7)/32, where m(n) = 2*n - 1.at n=14A336535
• Numbers n whose symmetric representation of sigma(n) has a maximum width of 2 that occurs exactly once (at the diagonal).at n=32A338488
• Triangular numbers (A000217) with arithmetic derivative (A003415) a palindrome (A002113).at n=12A353217