121241

Appears in sequences

• Number of A095320-primes in range ]2^n,2^(n+1)].at n=20A095330
• Indices of primes in sequence defined by A(0) = 19, A(n) = 10*A(n-1) - 1 for n > 0.at n=8A102031
• a(1)=1; a(n) = floor((3 + sqrt(21))*a(n-1)/2) for n > 1.at n=9A196472