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A048420 Primes whose consecutive digits differ by 8 or 9. 7
2, 3, 5, 7, 19, 191, 809, 919, 9091, 80809, 80909, 91909, 190909, 909091, 1908091, 1909091, 9090919, 9091909, 19090909, 80919191, 190909091, 191908091, 809080919, 809191919, 908080909, 919080919, 919191919, 1909080809 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

MATHEMATICA

Join[{2, 3, 5, 7}, Select[FromDigits/@Tuples[{0, 1, 8, 9}, 10], PrimeQ[#] && AllTrue[ Abs[ Differences[ IntegerDigits[#]]], #>7&]&]] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Oct 08 2017 *)

CROSSREFS

Cf. A048413-A048419.

Sequence in context: A236303 A117315 A158473 * A048405 A110457 A320584

Adjacent sequences:  A048417 A048418 A048419 * A048421 A048422 A048423

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Apr 15 1999

EXTENSIONS

More terms from Naohiro Nomoto, Jul 28 2001

STATUS

approved

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Last modified August 7 10:19 EDT 2022. Contains 355985 sequences. (Running on oeis4.)