65025

Appears in sequences

• Generalized Euler phi function (for p=2).at n=16A003473
• a(n) = (8*n + 7)^2.at n=31A017150
• a(n) = (9*n + 3)^2.at n=28A017198
• a(n) = (10*n + 5)^2.at n=25A017330
• a(n) = (11*n + 2)^2.at n=23A017414
• a(n) = (12*n + 3)^2.at n=21A017558
• Squares k^2 in which the digits of k appear.at n=37A029773
• Squares which are palindromes in base 11.at n=14A029997
• Numbers k such that sigma(phi(k)) = phi(sigma(k)).at n=16A033632
• Squares with initial digit '6'.at n=19A045789
• a(n) = (2^n - 1)^2.at n=7A060867
• Numbers k such that sigma(phi(k^3)) = phi(sigma(k^3)).at n=7A063824
• a(n) = (4*n^2 - 1)^2.at n=8A069075
• Numbers k such that sigma(phi(k)) divides phi(sigma(k)).at n=29A073858
• Numbers k having exactly one divisor d such that in binary representation d and k/d have the same number of 1's as k.at n=13A080026
• a(n) = n*(2*n+1)^2.at n=25A084367
• Resultant of the polynomial x^n-1 and the Chebyshev polynomial of the second kind U_2(x).at n=7A085435
• Expansion of (1 + 2*x^2)/((1 + x)*(1 - 2*x)*(1 - 2*x^2)).at n=15A085903
• Smallest square k == 1 (mod some n-th power), k > 1.at n=8A088037
• Triangle read by rows: T(n,k) = number of distinct lines through the origin in the n-dimensional cubic lattice of side length k with one corner at the origin.at n=74A090030