42025

Appears in sequences

• Squares formed by concatenating other squares, not ending in 0.at n=27A009404
• Numbers k such that k | 4^k + 1.at n=14A015950
• Numbers k that divide 4^k + 1, k not a power of 5.at n=7A015974
• a(n) = (5*n)^2.at n=41A016850
• a(n) = (6*n + 1)^2.at n=34A016922
• a(n) = (7*n+2)^2.at n=29A017006
• a(n) = (8*n + 5)^2.at n=25A017126
• a(n) = (9*n + 7)^2.at n=22A017246
• a(n) = (10*n + 5)^2.at n=20A017330
• a(n) = (11*n + 7)^2.at n=18A017474
• a(n) = (12*n + 1)^2.at n=17A017534
• n written in fractional base 6/4.at n=35A024637
• Squares k^2 in which the digits of k appear.at n=31A029773
• Numbers that are both lucky and square.at n=33A031162
• Erroneous version of A039686.at n=10A038628
• Squares which are the concatenation of two nonzero squares.at n=12A039686
• Numbers k that divide 8^k + 2^k.at n=34A045581
• Squares with initial digit '4'.at n=17A045787
• Denominator of 1/25 - 1/n^2.at n=36A061044
• Squares the sum of the squares of whose digits are squares.at n=13A061090