A099083 Numbers k such that 1.2. ... .k-1.k - 2 is prime (where dot between numbers means concatenation).

5, 31, 103, 111, 119, 201

Offset: 1

Author

Farideh Firoozbakht, Nov 03 2004

Keywords

• base
• more
• nonn

Comments

Each term is odd and next term is greater than 2200.

Any further terms exceed 13000. - Lucas A. Brown, Mar 06 2024

Any further terms exceed 30000. - Michael S. Branicky, Sep 13 2024

Examples

			31 is in the sequence because 12345678910111213141516171819202122232425262728293031 - 2 is prime.
		

Crossrefs

Cf. A099081, A099082.