55420693056
domain: N
Appears in sequences
- Square triangular numbers: numbers that are both triangular and square.at n=8A001110
- Nontrivial binomial coefficients which are perfect powers (A001597).at n=7A075760
- Sum of the areas of the first n+1 Pell triangles.at n=15A096979
- Numbers which are powerful(1) (A001694) and triangular at the same time.at n=10A113938
- a(1) = 1; thereafter a(n+1) = T(8*a(n)), where T(i) = i*(i+1)/2 is the i-th triangular number.at n=3A185097
- A204512(n)^2 = floor[A055872(n)/8]: Squares such that appending some digit in base 8 yields another square.at n=17A204504
- Square triangular numbers that are the sum of 2 nonzero nonconsecutive triangular numbers.at n=4A267297