A242212 a(1) = 4. a(n) = A222209(a(n-1)).

4, 5, 7, 11, 19, 37, 71, 151, 379, 1051, 3307, 11483, 44453

Offset

1,1

Comments

Question: what is the smallest composite number > 4 in this sequence?

Links

Table of n, a(n) for n=1..13.

Crossrefs

Cf. A222208, A222209.

Sequence in context: A237133 A253584 A062709 * A129302 A216536 A051658

Adjacent sequences: A242209 A242210 A242211 * A242213 A242214 A242215

Keyword

more,nonn

Author

J. Lowell, May 07 2014

Extensions

a(13) from Alois P. Heinz, May 07 2014

Status

approved