7247757311

Appears in sequences

• a(1) = 1. For n>1, let x = a(n-1)+1; then a(n) is the first prime in the sequence 2*x-1, 2*x-3, 4*x-1, 4*x-3, 8*x-1, 8*x-3, ..., (2^k)*x-1, (2^k)*x-3, ...at n=11A083201
• a(n) = (n-1)*2^n - 1.at n=27A163383
• Least prime p such that p+1 is divisible by 2^n and not by 2^(n+1).at n=28A201914
• a(n) is the least prime of the form 2^j*3^k - 1, j > 0, k > 0, j + k = n. a(n) = 0 if no such prime exists.at n=29A337437