19908

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 MTN = ZSM-39 [Si136O272].qR starting with a T1 atom.at n=13A019185
• T(n,n+2), array T as in A047150.at n=8A047157
• Pseudo-Kaprekar triples: q such that if q=x+y+z, then q^3=x*10^i + y*10^j + z, where (y*10^j+z < 10^i) and z < 10^j.at n=24A060768
• Numbers k such that k+1 is composite and divides 3^k-2^k.at n=35A068410
• Number of conjugacy classes in the group GL(3,Z_n).at n=26A086768
• Triangle read by rows: T(n,k) is number of noncrossing trees with n edges and having k nonroot branch nodes.at n=18A101431
• Triangle, read by rows, defined by: T(n,k) = Sum_{j=0..n-k-1} T(j+k,k)*T(n-j,k+1) for n > k >= 0, with T(n,n) = n+1.at n=23A127058
• Column 2 of triangle A127058.at n=4A127059
• Number of possible outcomes after n steps of the Zeno gambling process.at n=24A137414
• a(n) = 686*n + 14.at n=28A157366
• Sum of a positive square and a positive cube in at least three ways.at n=35A171385
• Numbers k such that sigma(tau(k)) equals the sum of distinct primes dividing k.at n=39A173325
• Partial sums of A174928.at n=34A174929
• Number of (n+1) X 4 0..1 matrices with each 2 X 2 subblock idempotent.at n=14A224545
• Number of partitions p of 2n+1 such that n - (number of parts of p) is a part of p.at n=21A238742
• Expansion of (b(q) / b(q^2))^2 in powers of q where b() is a cubic AGM theta function.at n=20A242405
• Numbers k such that 7*R_k - 20 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=15A256830
• Numbers of the form N = a+b+c such that N^3 = concat(a,b,c); a, b, c > 0.at n=10A328198
• Coefficients of polynomials related to the sum of Gaussian binomial coefficients for q = 2. Triangle read by rows, T(n,k) for 0 <= k <= n.at n=49A329154
• a(n) = Sum_{k=1..n} k^2 * floor(n/k)^2.at n=29A350123