20247

Appears in sequences

• a(n) = n*(4*n^2 + 2*n + 1).at n=17A110451
• Numbers m such that m*reversal(m) contains every decimal digit exactly once.at n=4A178929
• Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock summing to 4.at n=5A183623
• Number of (n+1) X 7 0..2 arrays with every 2 X 2 subblock summing to 4.at n=5A183629
• Number of n X n toroidal 0..2 arrays with each element having the sum of its vertical neighbors equal to the sum of its horizontal neighbors.at n=6A184098
• T(n,k) = Number of n X k toroidal 0..2 arrays with each element having the sum of its vertical neighbors equal to the sum of its horizontal neighbors.at n=84A184099
• Number of (n+2)X5 binary arrays avoiding patterns 001 and 111 in rows and columns.at n=3A202373
• Number of (n+2)X6 binary arrays avoiding patterns 001 and 111 in rows and columns.at n=2A202374
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 001 and 111 in rows and columns.at n=17A202378
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 001 and 111 in rows and columns.at n=18A202378
• Number of (n+1) X 8 0..1 matrices with each 2 X 2 subblock idempotent.at n=12A224549
• The hyper-Wiener index of the hexagonal triangle T_n, defined in the He et al. reference.at n=5A248094
• Prime time numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60.at n=14A295014
• Numbers k not divisible by 10 such that k^2 and 2*k are in A046030.at n=5A308961
• Integers n such that the digit set of n^2 is {0,1,4,9}.at n=28A317579