A075599 a(1) = 7 and then the smallest prime that is obtained by placing digits on both sides of the previous term. Or smallest prime that encompasses a(n-1).

7, 173, 11731, 2117317, 421173173, 34211731733, 1342117317337, 813421173173377, 28134211731733771, 4281342117317337713, 142813421173173377131, 21428134211731733771317, 2214281342117317337713171, 2221428134211731733771317113, 922214281342117317337713171139

Offset

1,1

Links

Table of n, a(n) for n=1..15.

Crossrefs

Cf. A075595, A075596, A075597, A075598, A075600, A075601, A075602.

Sequence in context: A266306 A332117 A226598 * A012500 A220326 A094257

Adjacent sequences: A075596 A075597 A075598 * A075600 A075601 A075602

Keyword

base,nonn

Author

Amarnath Murthy, Sep 28 2002

Extensions

More terms from Sascha Kurz, Jan 20 2003

Further terms from Ray G. Opao, Nov 26 2004

Status

approved