139

Number
$139$ (one hundred and thirty-nine) is:


 * The $34$th prime number


 * The $2$nd of the $11$th pair of twin primes, with $137$


 * The $9$th of $11$ primes of the form $2 x^2 + 11$:
 * $2 \times 8^2 + 11 = 139$


 * The $26$th happy number after $1, 7, 10, 13, 19, 23, \ldots, 91, 94, 97, 100, 103, 109, 129, 130, 133$:
 * $139 \to 1^2 + 3^2 + 9^2 = 1 + 9 + 81 = 91 \to 9^2 + 1^2 = 81 + 1 = 82 \to 8^2 + 2^2 = 64 + 4 = 68 \to 6^2 + 8^2 = 36 + 64 = 100 \to 1^2 + 0^2 + 0^2 = 1$


 * The smaller of the smallest pair of primes whose prime gap is $10$:
 * $149 - 139 = 10$

Also see