53474

Appears in sequences

• Conjectured smallest Sierpiński numbers of the second kind S, base b=2,3,4,5,..., where S*b^n+1 is composite for all n>=1 and gcd(S+1, b-1) = 1.at n=43A123159
• a(n) is the largest m such that p = n-th popular prime = A385503(n) is popular on the interval [2,m].at n=6A289663