A120824 a(n) consecutive digits ascending beginning with the digit 6 give a prime.

2, 6, 36, 122, 336, 82812

Offset: 1

Author

Robert G. Wilson v, Jul 05 2006

Keywords

• nonn
• base
• hard
• more

Comments

Digits are in ascending order beginning with 6 and after 9 comes 0.

The sequence "a(n) consecutive digits descending beginning with the digit 6 give a prime" has no terms.

a(7) >= 100000. - Michael S. Branicky, Apr 07 2025

Examples

			6 is a term since 678901 is a prime.
		

Crossrefs

Cf. A006055, A120819, A120820, A120821, A120822, A120823, A120825, A120826, A120827.

Programs

Mathematica

fQ[n_] := PrimeQ@ FromDigits@ Mod[5+Range@n, 10]; lst = {}; Do[ If[fQ@n, AppendTo[lst, n]; Print@n], {n, 5000}]; lst

Extensions

a(6) from Michael S. Branicky, Apr 05 2025