A120822 a(n) consecutive digits ascending beginning with the digit 4 give a prime.

4, 8, 194

Offset: 1

Author

Robert G. Wilson v, Jul 05 2006

Keywords

• nonn
• base
• hard
• bref
• more

Comments

Digits are in ascending order beginning with 4; after 9 comes 0.

a(4) > 10^5. - Michael S. Branicky, Apr 08 2025

Examples

			8 is a term since 45678901 is a prime.
		

Crossrefs

Cf. A006055, A120829, A120819, A120820, A120821, A120823, A120824, A120825, A120826, A120827.

Programs

Mathematica

fQ[n_] := PrimeQ@ FromDigits@ Mod[3+Range@n, 10]; lst = {}; Do[ If[fQ@n, AppendTo[lst, n]; Print@n], {n, 10000}]; lst