99221

Appears in sequences

• Brilliant numbers such that when they are concatenated with their 10's complement, which also must be brilliant, the result is a prime.at n=13A084629
• a(n) = prime(2*n-1)*prime(2*n).at n=32A089581
• Product of the n-th cousin prime pair.at n=18A143206
• a(n) = 100*n^2 + 100*n + 21.at n=31A152161
• Numbers k such that exactly one d, 2 <= d <= k/2, exists which divides binomial(k-d-1, d-1) and is not coprime to k.at n=27A178071
• Numbers that are both a sum and a product of two or more consecutive primes.at n=35A254859
• Semiprimes whose prime factors are of equal binary length and which differ from each other in one bit position only.at n=38A261073
• Semiprimes p*q for which p and q are successive primes and their binary representations differ from each other in one bit position only.at n=18A261080
• Numbers k such that k divides Sum_{j=0..k} j^(k-j).at n=17A341437