64009

Appears in sequences

• Sum of first n cubes; or n-th triangular number squared.at n=22A000537
• Squares formed by concatenating other squares, not ending in 0.at n=31A009404
• Squares of odd triangular numbers.at n=11A014736
• Positive integers k such that k divides 12^k - 1.at n=10A014951
• Numbers k such that k | 10^k + 1.at n=12A015958
• a(n) = (8*n + 5)^2.at n=31A017126
• a(n) = (9*n + 1)^2.at n=28A017174
• a(n) = (10*n + 3)^2.at n=25A017306
• a(n) = (11*n)^2.at n=23A017390
• a(n) = (12*n + 1)^2.at n=21A017534
• Squares which remain squares when the last digit is removed.at n=12A023110
• Numbers k that divide the (right) concatenation of all numbers <= k written in base 23 (most significant digit on left).at n=29A029468
• Smallest nontrivial extension of n-th square which is a square not ending 00.at n=7A030688
• Squares and omitting some digit gives another number in this list.at n=27A034378
• Erroneous version of A039686.at n=12A038628
• Squares which are the concatenation of two nonzero squares.at n=14A039686
• Numbers k that divide 7^k + 4^k.at n=13A045592
• Numbers k that divide 6^k + 5^k.at n=14A045595
• Squares with initial digit '6'.at n=17A045789
• sigma(n)-n is a perfect square associated with A049226.at n=32A049228