a(n) = k smallest exponent of N = 2^k of first prime(1) = 2 where string "p(1) ... p(n)" appears in the decimal representation of N (n=1,2,...).

A173550

a(n) = k smallest exponent of N = 2^k of first prime(1) = 2 where string "p(1) ... p(n)" appears in the decimal representation of N (n=1,2,...).

Terms

    a(0) =1a(1) =41a(2) =81a(3) =256a(4) =2810a(5) =19680a(6) =131516a(7) =1812049

External references