131137

Appears in sequences

• Juxtapose pairs of primes (starting at 1).at n=16A007794
• Concatenate the n-th and (n+1)st prime.at n=31A045533
• Concatenations of pairs of primes that differ by 6.at n=19A103206
• Positive integers with the same number of 1s in base 10 and base 2.at n=28A153115
• Semiprimes which are concatenation of two consecutive primes.at n=13A244057
• Numbers k such that the k-th composition in standard order is a triple (w,x,y) such that 2w = 3x + 4y.at n=6A357489
• Bitmaps of king + rook vs. king checkmate patterns on a standard 8 X 8 board.at n=15A362950
• Number of equal-length matchings of 2n uniformly spaced points on a circle.at n=33A381194