A110720 Beginning with 5, concatenation of n successive numbers such that every partial concatenation is a prime.

5, 23, 353637, 18192021, 7576777879, 67891011, 71727374757677, 12121213121412151216121712181219, 5678910111213, 1194119511961197119811991200120112021203

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Example

5,523,523353637,... are all prime.

Crossrefs

Cf. A110714, A110715, A110716, A110717, A110718, A110719, A110721.

Sequence in context: A345713 A174106 A120660 * A200822 A112613 A305057

Adjacent sequences: A110717 A110718 A110719 * A110721 A110722 A110723

Keyword

base,hard,nonn

Author

Amarnath Murthy, Aug 05 2005

Extensions

More terms from Jon E. Schoenfield, Jul 11 2010

Status

approved