345111

Appears in sequences

• a(n) is the smallest m such that m < 10^n, 10^n + m is prime and if the natural number k is such that 1 < k < 10 and 3 doesn't divide k*10^n + m then k*10^n+m is prime.at n=9A078728
• For any n > 0, let S_n(0) be the concatenation of the numbers in the range 1..n (in increasing order); for k=1..n, S_n(k) is obtained by removing the rightmost occurrence of k in S_n(k-1), if any; a(n) is the numerical value of S_n(n) (or 0 if S_n(n) is empty).at n=14A330398