19099919

Properties

Appears in sequences

• Smallest prime beginning a complete Cunningham chain of length n (of the first kind).at n=7A005602
• a(n) = smallest prime p such that the first n iterates of p under x->2x+1 are all primes.at n=7A057331
• Smallest number whose Sophie Germain degree (see A063377) is n.at n=8A063378
• Numbers that remain prime through 7 iterations of function f(x) = 2x + 1.at n=0A138025
• Numbers n such that n remains prime through 6 iterations of function f(x) = 2x + 1.at n=8A278932
• Indices of records in A063377.at n=4A339581
• Prime numbersat n=1216984