5666661

Appears in sequences

• Smallest triangular number containing exactly n 6's.at n=4A036523
• Triangular numbers with internal digits 6.at n=19A069698
• a(1) = 6 and then the smallest triangular numbers, larger than the previous term, such that sum of two neighbors is also a triangular number.at n=16A072521
• Triangular numbers composed of digits {1,5,6}.at n=20A119132
• Number of ways to choose two points on a centered hexagonal grid of size n.at n=33A241219
• a(n) is the least integer that can be expressed as the difference of two heptagonal numbers in exactly n ways.at n=22A334036