A072928 Let p_0(n) := the n-th prime number, taking the first prime number to be 2; p_[i+1](n) = p_i(p_i(n)); then a(n) := p_n(1).

2, 3, 11, 5381, 75063692618249

Offset

0,1

Links

Table of n, a(n) for n=0..4.

Formula

p_0(n) := the n-th prime number, taking the first prime number to be 2 p_[i+1](n) := p_i(p_i(n)) a(n) := p_n(1)

Example

a(1)=3 because p_1(1)=p_0(p_0(1))=p_0(2)=3.

Crossrefs

Cf. A007097.

Sequence in context: A211349 A096456 A262201 * A140970 A058523 A103782

Adjacent sequences: A072925 A072926 A072927 * A072929 A072930 A072931

Keyword

nonn

Author

Anonymous, Aug 12 2002

Status

approved