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A120828 Primes with n consecutive digits descending beginning with the digit one. 2
3, 5, 35, 139, 153, 253, 1053, 2015, 3703 (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..9.

EXAMPLE

5 is a term since 10987 is a prime.

MATHEMATICA

fQ[n_] := PrimeQ@ FromDigits@ Mod[2-Range@n, 10]; lst = {}; Do[ If[fQ@n, AppendTo[lst, n]; Print@n], {n, 6000}]; lst

CROSSREFS

Cf. A120804, A120819 A120829.

Sequence in context: A001790 A173092 A057908 * A077784 A145640 A222496

Adjacent sequences:  A120825 A120826 A120827 * A120829 A120830 A120831

KEYWORD

base,hard,nonn

AUTHOR

Robert G. Wilson v, Jul 05 2006

STATUS

approved

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Last modified February 21 22:56 EST 2018. Contains 299427 sequences. (Running on oeis4.)