40401

Appears in sequences

• Squares formed by concatenating other squares, not ending in 0.at n=25A009404
• a(n) = (6*n+3)^2.at n=33A016946
• a(n) = (7*n + 5)^2.at n=28A017042
• a(n) = (8*n + 1)^2.at n=25A017078
• a(n) = (9*n + 3)^2.at n=22A017198
• a(n) = (10*n + 1)^2.at n=20A017282
• a(n) = (11*n + 3)^2.at n=18A017426
• a(n) = (12*n + 9)^2.at n=16A017630
• Squares whose digits are squares.at n=19A019544
• Squares which when written backwards remain square (final 0's excluded).at n=20A033294
• Non-palindromic squares which when written backwards remain square (and still have the same number of digits).at n=11A035090
• Odd refactorable numbers.at n=23A036896
• Square refactorable numbers.at n=31A036907
• Squares with initial digit '4'.at n=13A045787
• n is odd and divisible by number of divisors of n and sum of digits of n.at n=8A057530
• Squares composed of digits {0,1,4}, not ending with zero.at n=6A058414
• Smallest square of the form [n digits][same n digits][further digits].at n=2A061051
• Squares such that each digit is a square and the sum of the digits is a square.at n=13A061270
• a(1) = 1; a(n+1) = smallest square > a(n) with leading digit equal to final digit of a(n) and final digit not 0.at n=7A061449
• Squares whose reversal is also a square.at n=29A061457