138721

Appears in sequences

• 1000000n+1, 1000000n+3, 1000000n+7, 1000000n+9 are all primes.at n=14A064965
• The number of P-positions in the game of Nim with up to five piles, allowing for piles of zero, such that the total number of objects in all piles doesn't exceed 2n.at n=29A238147
• Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001011.at n=25A261551