559902916

Appears in sequences

• Triangular numbers that are 1/6 of another triangular number.at n=10A077289
• Positive triangular numbers (A000217) that are pentagonal numbers (A000326) divided by 2.at n=4A259156
• Positive hexagonal numbers (A000384) that are pentagonal numbers (A000326) divided by 2.at n=2A259162