21556

Appears in sequences

• 4-dimensional analog of centered polygonal numbers.at n=15A006323
• Expansion of x/(1 - x - 2*x^3 - 2*x^5 - x^7).at n=18A143373
• Numbers k such that the decimal expansions of both k and k^2 have 1 as smallest digit and 6 as largest digit.at n=22A257197
• Poincaré series for hyperbolic reflection group with Coxeter diagram shown in Comments.at n=13A265054
• Number of integer partitions of n whose product is greater than the product of their multiplicities.at n=37A353505
• Consecutive states of the linear congruential pseudo-random number generator (625*s + 6571) mod 31104 when started at s=1.at n=9A385279