23273900

Appears in sequences

• a(n) = Floor[1/2((1-2/Sqrt[3])^n+(1-2/Sqrt[3])^n)].at n=23A116953
• a(n) is the sum of n consecutive triangular numbers immediately preceding a triangular number T(k), which is also equal to the sum of n-1 consecutive triangular numbers immediately following T(k).at n=25A392441