131201

Appears in sequences

• Numbers k > 1 such that, in base 8, k and k^2 contain the same digits in the same proportion.at n=31A061662
• Number of slanted 2 X n (i=1..2) X (j=i..n+i-1) 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, 4 in the lower right corner, and with no element having more than 3 neighbors with the same value.at n=24A165394
• Sums of three Mersenne primes.at n=41A174055
• Bitmaps of king + rook vs. king checkmate patterns on a standard 8 X 8 board.at n=17A362950