74528

Appears in sequences

• Numbers k such that k and k^2 have the same set of digits.at n=30A029793
• Values of n^2 - 1 resulting from A050795.at n=21A050799
• Numbers k such that k and k^2 use only the digits 2, 4, 5, 7 and 8.at n=17A137097
• a(n) = number of ways to dispose two pawns on a chessboard of size n X n (two dispositions are equivalent if one can be rotated or reflected to give the other one).at n=33A141582
• a(n) = 4*(3*n+1)*(3*n+2).at n=45A144410
• Numbers k such that tau(k+1) - tau(k) = 3, where tau(k) = the number of divisors of k (A000005).at n=18A230653
• Number of length 1+3 0..n arrays with no disjoint pairs in any consecutive four terms having the same sum.at n=15A247727
• Number of length n+3 0..3 arrays with no four consecutive terms having the maximum of any two terms equal to the minimum of the remaining two terms.at n=6A250382
• T(n,k)=Number of length n+3 0..k arrays with no four consecutive terms having the maximum of any two terms equal to the minimum of the remaining two terms.at n=42A250387
• Number of length 7+3 0..n arrays with no four consecutive terms having the maximum of any two terms equal to the minimum of the remaining two terms.at n=2A250393
• Zeroless numbers n such that n and n^2 have the same set of decimal digits.at n=11A257763
• Numbers n such that both n and n squared contain exactly the same digits, and n is not divisible by 10.at n=18A258231
• Expansion of the e.g.f. exp(-2*x)/(1-4*x).at n=5A296660
• Numbers k such that k and k+1 are both half-Zumkeller numbers (A246198).at n=13A331371