12242424

Appears in sequences

• Least n-digit multiple of n such that the r-th digit is prime if r is a prime else it is composite. The location and value of the most significant digit is 1. 0 if no such number exists.at n=7A113572
• a(n) is the least n-digit number whose k-th digit is prime if k is prime, composite if k is composite, and 1 if k=1.at n=7A113574
• Concatenation of the first n entries of the difference sequence of prime numbers (see A001223).at n=7A255307