20126

Appears in sequences

• Matrix logarithm of triangle A104980.at n=37A104986
• Pentagonal numbers (A000326) whose digit reversal is a semiprime (A001358).at n=35A115709
• Pentagonal numbers which are the arithmetic mean of two consecutive primes.at n=16A234531
• Expansion of Product_{k>=0} 1 / (1 - x^(3^k))^3.at n=27A374627
• Pentagonal numbers which are products of three distinct primes.at n=25A381650