A117696 Primes in sequence a(1)=2, a(n+1)=2^a(n)-3^(n-1).

2, 3, 5, 23, 8388581

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Formula

a(1)=2, a(n+1)=2^a(n)-3^(n-1)

Example

a(1)=2, a(2)=2^a(1)-3^0=2^2-3^0=3

Crossrefs

Cf. A075883.

Sequence in context: A053708 A137070 A084730 * A256463 A279864 A324289

Adjacent sequences: A117693 A117694 A117695 * A117697 A117698 A117699

Keyword

hard,nonn

Author

Parviz Afereidoon (afereidoon(AT)gmail.com), Apr 13 2006

Status

approved