Chiliagonal number

A chiliagonal number is a number that can be arranged to form a chiliagon. The mathematical formula is n(499n-498). The first few chiliagonal numbers are:

• 1
• 1000
• 2997
• 5992
• 9985
• 14976
• 20965
• 27952
• 35937
• 44920
• 54901
• 65880
• 77857
• 90832
• 104805
• 119776
• 135745
• 152712
• 170677
• 189640