A120829 - OEIS

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A120829

Primes with n consecutive digits descending beginning with the digit four.

2

2, 64, 176, 1502, 4676, 6933, 8173

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Digits are in descending order beginning with 1 and after 0 comes 9.

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

2 is a term since 43 is a prime.

MATHEMATICA

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

CROSSREFS

Cf. A120804, A120823, A120828.

Sequence in context: A004853 A249073 A064010 * A226397 A264481 A120121

Adjacent sequences: A120826 A120827 A120828 * A120830 A120831 A120832

KEYWORD

base,hard,nonn

AUTHOR

Robert G. Wilson v, Jul 05 2006

STATUS

approved