A120827 a(n) consecutive digits ascending beginning with the digit 9 give a prime.

13, 29, 43

Offset: 1

Author

Robert G. Wilson v, Jul 05 2006

Keywords

• nonn
• base
• hard
• bref
• more

Comments

Digits are in ascending order beginning with 9 and after 9 comes 0.

The sequence "a(n) consecutive digits descending beginning with the digit 9 give a prime" has no terms.

There is no further term up to 26000. - Farideh Firoozbakht, Sep 11 2006

There is no further term up to 150000. - Michael S. Branicky, Apr 22 2025

Examples

			13 is a term since 9012345678901 is a prime.
		

Crossrefs

Cf. A006055, A120819, A120820, A120821, A120822, A120823, A120824, A120825, A120826.

Programs

Mathematica

fQ[n_] := PrimeQ@ FromDigits@ Mod[8+Range@n, 10]; lst = {}; Do[ If[fQ@n, AppendTo[lst, n]; Print@n], {n, 5000}]; lst
Flatten[Position[Table[FromDigits[PadRight[{},n,{9,0,1,2,3,4,5,6,7,8}]],{n,100}],?PrimeQ]] (* _Harvey P. Dale, Sep 06 2015 *)