180337

Properties

Appears in sequences

• G.f. satisfies: A(x) = x*Sum{n>=0} A( n*x/(1+n*x) )^n.at n=6A187736
• Minimal natural number (in decimal representation) with n prime substrings in base-5 representation (substrings with leading zeros are considered to be nonprime).at n=20A217305
• a(n) is the first prime p such that the concatenations of n consecutive primes, starting with p, in both forward and backward directions, are prime.at n=27A384958
• Prime numbersat n=16371