19628

Appears in sequences

• Aliquot sequence starting at 276.at n=12A008892
• Least term in period of continued fraction for sqrt(n) is 10.at n=30A031434
• Numbers whose base-3 representation contains exactly one 0 and no 1's.at n=33A044970
• a(n) = 3^n - (n+1)*(n+2)/2.at n=9A061982
• Number of permutations of length n which avoid the patterns 1234, 2431, 3241.at n=10A116789
• Triangle read by rows: T(n,k) is the number of ternary words of length n on {0,1,2}, having k isolated 0's (n >= 0, k >= 0).at n=36A120924
• Numbers that appear exactly five times in A101402. (Also indices of fives in A101403.).at n=13A129117
• a(n) = 100*n^2 + 2*n.at n=13A158127
• a(n) = 784*n^2 + 28.at n=5A158659
• a(n) = 25*n^2 + n.at n=27A173089
• Triangle read by rows: T(n,m) (n>=0, 1 <= m <= n+1) = number of unlabeled rigid interval posets with n non-maximal and m maximal elements.at n=37A193344
• Number of unlabeled rigid interval posets with n non-maximal and 2 maximal elements.at n=8A194530
• Triangle read by rows: T(n,k) is the number of length-n ascent sequences without flat steps, containing k zeros.at n=57A218757
• Triangle a(n, k) read by rows: coefficient triangle that gives Lucas powers and sums of Lucas powers.at n=46A317360
• a(n) = (n + 2)*(n^2 + n - 1).at n=26A318765
• Numbers k such that usigma(uphi(k)) = uphi(usigma(k)), where usigma is the sum of unitary divisors function (A034448) and uphi is the unitary totient function (A047994).at n=43A329730
• a(n) = n * Sum_{d|n} binomial(d+2,3)/d.at n=41A343544
• Number of compositions (ordered partitions) of n into at most 5 prime powers (including 1).at n=42A347775