18496

Appears in sequences

• Sum of first n cubes; or n-th triangular number squared.at n=16A000537
• a(n) = (prime(n) - 1)^2.at n=32A005722
• Indices of prime Cullen numbers: numbers k such that k*2^k + 1 is prime.at n=5A005849
• Expansion of e.g.f. arcsinh(arctan(x) * exp(x)).at n=8A012414
• Squares of even triangular numbers.at n=7A014738
• Numbers n such that tau(sigma(n))= tau(tau(n)).at n=36A015730
• a(n) = (4*n)^2.at n=34A016802
• a(n) = (5*n + 1)^2.at n=27A016862
• a(n) = (6*n + 4)^2.at n=22A016958
• a(n) = (7*n + 3)^2.at n=19A017018
• a(n) = (8*n)^2.at n=17A017066
• a(n) = (9*n + 1)^2.at n=15A017174
• a(n) = (10*n + 6)^2.at n=13A017342
• a(n) = (11*n + 4)^2.at n=12A017438
• a(n) = (12*n + 4)^2.at n=11A017570
• Squares which remain squares when the last digit is removed.at n=11A023110
• Expansion of e.g.f. tan(x)*tan(tan(x))/2 (even powers only).at n=4A024297
• a(n) = (1/4)*floor(n/2)*floor((n-1)/2)*floor((n-2)/2)*floor((n-3)/2).at n=35A028723
• a(n+1) is next smallest nontrivial square containing a(n) as a substring, initial term is 4.at n=3A050630
• a(n+1) is next smallest nontrivial square containing a(n) as a substring, initial term is 9.at n=3A050632