84847

Appears in sequences

• Pentagonal numbers (A000326) that are the product of 2 palindromes greater than 1.at n=21A115745
• Numbers which are both lucky and pentagonal.at n=19A128511
• Least pentagonal number P(m) > P(n) such that P(m)+P(n) is again a pentagonal number, 0 if no such m exists.at n=21A136114
• Number of length n inversion sequences avoiding the patterns 120 and 210.at n=9A279573