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

5, 31, 103, 111, 119, 201

Offset

1,1

Comments

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

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

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Cf. A099081, A099082.

Sequence in context: A362304 A024399 A183520 * A212523 A096944 A053699

Adjacent sequences: A099080 A099081 A099082 * A099084 A099085 A099086

Keyword

base,more,nonn

Author

Farideh Firoozbakht, Nov 03 2004

Status

approved