18225

Appears in sequences

• Squares of partition numbers.at n=14A001255
• Numbers of the form 3^i*5^j with i, j >= 0.at n=35A003593
• a(n) = n*(7*n^2 - 1)/6.at n=25A004126
• Numbers n such that tau(sigma(n))= tau(tau(n)).at n=35A015730
• a(n) = (4n + 3)^2.at n=33A016838
• a(n) = (5*n)^2.at n=27A016850
• a(n) = (6*n+3)^2.at n=22A016946
• a(n) = (7*n+2)^2.at n=19A017006
• a(n) = (8*n + 7)^2.at n=16A017150
• a(n) = (9*n)^2.at n=15A017162
• a(n) = (10*n + 5)^2.at n=13A017330
• a(n) = (11*n + 3)^2.at n=12A017426
• a(n) = (12*n + 3)^2.at n=11A017558
• a(n) = n^2*(n-1)^3/4.at n=10A019584
• Numbers of form 5^i*9^j, with i, j >= 0.at n=19A025624
• a(n) = n + (n+1)^2 + (n+2)^3.at n=24A027620
• Squares of lucky numbers.at n=29A032598
• Numbers k such that sigma(phi(k)) = phi(sigma(k)).at n=10A033632
• Numbers whose prime factors are 3 and 5.at n=20A033849
• Squares which can be rearranged into squares with the same number of digits.at n=34A034289