56123

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of function f(x) = 8x + 9.at n=23A023295
• Convoluted convolved Fibonacci numbers G_j^(8).at n=10A089095
• Primes of the form k^2 + k + 55661, with k >= 0.at n=18A116206
• a(n) is the smallest number not already in the sequence, such that the concatenation of all a(n) displays the periodic digit string 1, 2, 3, 4, 5, 6 (and repeat).at n=26A165304
• Expansion of Product_{1 <= i < j} 1/(1 - x^(i*j)).at n=45A321285
• Number of n-digit left- or right-truncatable primes with no consecutive zero digits.at n=37A346662
• Slice of elementary triangular automaton rule 210, starting from a lone 1 cell.at n=15A384193
• Prime numbersat n=5695