400000009

Properties

Appears in sequences

• Smallest prime in which the n-th significant digit is a 4.at n=7A069594
• Happy primes of the form a*10^k + b with single-digit a and b, a > 0, k > 0.at n=31A109902
• a(n) = 9 + 4 * 10^n.at n=7A350382
• Prime numbersat n=21336327