31279
domain: N
Appears in sequences
- a(n) is the concatenation of n and 9n.at n=30A009474
- Numbers whose set of base-13 digits is {1,3}.at n=34A032920
- Least positive integer not representable using exactly n 9's and the operations +-*/().at n=14A066409
- The arithmetic mean of the n-th and (n+1)-st cubes, rounded down.at n=31A147656
- Smallest palindromic number of 5 digits in two bases differing by n.at n=4A216899
- Semiprimes generated by the polynomial 2 * n^2 + 29.at n=34A241554
- G.f. A(x) satisfies A(x) = 1 + x/(1-9*x^3)^(1/3) * A( x/sqrt(1-9*x^3)^(1/3) ).at n=13A251176
- Composite numbers of the form 2*k^2 + 29.at n=34A352949