225625

Appears in sequences

• Squares composed of digits {2,5,6}.at n=6A030484
• Smallest nontrivial extension of n-th square which is a square not ending 00.at n=14A030688
• Squares which are the concatenation of two nonzero squares.at n=20A039686
• Squares composed of two '1-digit' overlapping subsquares.at n=2A048421
• Squares composed of three '2 digit' overlapping subsquares.at n=0A048427
• k^2 is a term if k^2 + (k-1)^2 and k^2 + (k+1)^2 are primes.at n=17A075577
• Squares whose decimal digits are nonsquares (2, 3, 5, 6, 7, 8).at n=18A077437
• Squares using only squarefree digits (2, 3, 5, 6, 7).at n=16A077676
• G.f.: (108*x^2+27*x+1)/(1+2*x-6*x^2-27*x^3).at n=9A103645
• Row sums of triangle A144275 (called S2hat(-2)).at n=6A144276
• Squares with an even number of digits, where the first half is a square and the second half is a nonzero square.at n=3A145848
• Squares which are concatenation of two positive squares with possible intervening zeros.at n=22A147608
• Number of n X 6 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=6A207701
• Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=5A207708
• Squares, without multiplicity, that are the concatenation of two integers (without leading zeros) the product of which is also a square.at n=21A258060
• Least number k such that the absolute value of the difference between the number of divisors of k and k-1 is equal to n.at n=49A285457
• Squares k (not ending in 0) such that the integer that is built up by concatenating the floors of the square roots of the two-digit numbers into which the original number is separated (from right to left) is the square root of the original number.at n=36A294497
• Numbers that can be expressed as x+2y+z such that x, y, z, x+y, y+z, and x+2y+z are all positive squares.at n=22A307481
• Perfect squares whose pattern of identical digits is unique among the squares.at n=21A374267
• Squares where larger digits have smaller multiplicity.at n=19A378498