57111

Appears in sequences

• Semiprimes for which both the sum and the product of the digits is also a semiprime.at n=41A118690
• Number of mobiles (circular rooted trees) on n nodes with thinning limbs.at n=15A124345
• Numbers k with squares that are concatenations k^2 = x//y such that x is an anagram of y.at n=22A162945
• a(n) = (3^n+6*(-4)^n)/7.at n=8A166035
• Expansion of Product_{k>=1} 1/(1 - x^k)^A007437(k).at n=13A301873
• Digits of the Copeland-Erdős constant taken in groups of five digits.at n=2A304652