205427

Properties

Appears in sequences

• a(n) is the smallest number writable in n different ways as the sum of two distinct nonzero pentagonal numbers.at n=4A332989
• Numbers which can be written in exactly five ways as a sum of two distinct nonzero pentagonal numbers.at n=0A333015
• a(n) is the smallest number which can be represented as the sum of two distinct nonzero n-gonal numbers in exactly n ways, or -1 if no such number exists.at n=2A374144
• Prime numbersat n=18418