1004004

Appears in sequences

• Squares of partition numbers.at n=22A001255
• Squares whose digits are squares.at n=31A019544
• Squares which when written backwards remain square (final 0's excluded).at n=31A033294
• Non-palindromic squares which when written backwards remain square (and still have the same number of digits).at n=16A035090
• Squares composed of digits {0,1,4}, not ending with zero.at n=7A058414
• Squares such that each digit is a square and the sum of the digits is a square.at n=18A061270
• 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=11A061449
• Squares k^2 such that reverse(k)^2 = reverse(k^2), excluding squares of palindromes.at n=14A064021
• Square such that the next three squares also having a square digit sum.at n=12A068834
• Squares with internal digits also forming a square > 0.at n=26A069701
• a(1) = 1, then smallest n-digit square which leaves a square at every step if most significant digit and least significant digit are deleted until a one-or two-digit digit square is obtained. a(2n) = 0 if no such square exists. a(2n+1) = 10^2n only if no nontrivial candidate exists.at n=6A077485
• Squares which leave a square at every step if most significant digit and least significant digit are deleted until a one-digit or two-digit square is obtained.at n=31A077487
• a(n) = x^2 = A090116(n)^2 is the least square that is "surrounded" by two closest primes, by prevprime(x^2) and nextprime(x^2) whose difference nextprime - prevprime = 2n.at n=31A090117
• Perfect powers not a multiple of 10 whose digit reversal is also a perfect power (not necessarily with the same exponent, but with exponent > 1).at n=34A110811
• a(n) = A061909(n)^2.at n=39A129967
• Perfect squares with property that their digit reversal is a larger perfect square.at n=8A156316
• Numbers which are perfect squares and either form equal or larger perfect squares when reversed.at n=24A156317
• Number of nondecreasing integer sequences of length 44 with sum zero and sum of absolute values 2n.at n=21A158178
• Number of nondecreasing integer sequences of length 45 with sum zero and sum of absolute values 2n.at n=21A158179
• Number of nondecreasing integer sequences of length 46 with sum zero and sum of absolute values 2n.at n=21A158180