A087341 Smallest prime which is a concatenation of n successive composite numbers.

89, 138140141, 87889091, 8890919293, 141516182021, 122123124125126128129, 121122123124125126128129, 707274757677788081, 21222425262728303233, 206207208209210212213214215216217, 405406407408410411412413414415416417

Offset: 2

Author

Amarnath Murthy, Sep 06 2003

Keywords

• base
• nonn

Comments

a(3) contains three digit composite numbers as every concatenation of two digit numbers n,n+2 and n+3 is == 0 (mod 7).

Examples

			a(2) = 89 is the concatenation of two successive composite numbers 8 and 9.
a(3) = 138140141 is the concatenation of 138,140 and 141.
		

Links

• G. L. Honaker, Jr. and Chris Caldwell, Prime Curios! 138140141.
• G. L. Honaker, Jr. and Chris Caldwell, Prime Curios! 87889091.

Crossrefs

Cf. A002808.

Extensions

More terms from David Wasserman, May 10 2005