78288
domain: N
Appears in sequences
- a(n) = T(n) concatenated with reverse(T(n)) divided by 11, where T(n) is the n-th triangular number.at n=41A084008
- Number of reduced 3 X 3 magilatin squares with magic sum n.at n=39A174020
- Number of obtuse triangles on a centered hexagonal grid of size n.at n=5A241226
- Numbers n such that 10^n + 9^(n+1) is prime.at n=21A275783
- Partial sums of A294629.at n=43A294630