A224700 a(n) = smallest prime p such that p + prime(n)# is next prime after p, where primorial prime(n)# = 2*3*..*prime(n).

3, 23, 4297, 20831323

Offset

1,1

Comments

a(5) > 10^20.

Links

Table of n, a(n) for n=1..4.

Formula

a(n) = A000230(A002110(n)/2).

Example

a(2)=23 because 23 is smallest prime such that 23+2*3=29 is next prime.

Crossrefs

Cf. A001223, A000230.

Sequence in context: A371346 A347680 A113577 * A352333 A355960 A264929

Adjacent sequences: A224697 A224698 A224699 * A224701 A224702 A224703

Keyword

nonn,hard,more

Author

Thomas Ordowski, Apr 16 2013

Status

approved