22840

Appears in sequences

• Coordination sequence for MgCu2, Mg position.at n=37A009931
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite NON = Nonasil-[ 4158 ] [Si88O176].4R starting with a T5 atom.at n=13A019211
• Sum of smallest parts of all partitions of n.at n=36A046746
• Sum of squares of terms in rows of triangle A104967.at n=14A104969
• Sum of squares of terms in even-indexed rows of triangle A104967.at n=7A104970
• a(n+1)-+a(n)=prime, a(n+1)*a(n)=Average of twin prime pairs, a(1)=3,a(2)=10.at n=33A154496
• Number of nondecreasing -2..2 vectors of length n whose dot product with some other -2..2 vector equals n.at n=24A226334
• Numbers k such that 7*R_(k+2) - 5*10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=15A257028
• G.f.: Product_{k>=1} (1 + 2*x^(k^2)) / (1-x^k).at n=28A280224
• Number of non-isomorphic set multipartitions (multisets of sets) of weight n without endpoints or singletons.at n=17A369926
• Numbers k such that k and the k-th triangular number T(k) = k*(k+1)/2 have only even digits.at n=9A383939