A120829 a(n) consecutive digits descending beginning with the digit 4 give a prime.

2, 64, 176, 1502, 4676, 7518, 8244, 8318

Offset: 1

Author

Robert G. Wilson v, Jul 05 2006

Keywords

• nonn
• base
• hard
• more

Comments

Digits are in descending order beginning with 4 and after 0 comes 9.

a(9) > 10^5. - Michael S. Branicky, Apr 22 2025

Examples

			2 is a term since 43 is a prime.
		

Crossrefs

Cf. A120804, A120822, A120828.

Programs

Mathematica

fQ[n_] := PrimeQ@ FromDigits@ Mod[5-Range@n, 10]; lst = {}; Do[ If[fQ@n, AppendTo[lst, n]; Print@n], {n, 10000}]; lst

Extensions

a(6)-a(7) corrected and a(8) from Michael S. Branicky, Apr 08 2025