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A048402
Primes with consecutive digits that differ exactly by 5.
7
2, 3, 5, 7, 61, 83, 383, 727, 72727, 94949, 1616161, 383838383, 727272727, 383838383838383, 38383838383838383, 72727272727272727, 94949494949494949, 383838383838383838383
OFFSET
1,1
LINKS
MATHEMATICA
Module[{nn=50, w1, w2}, w1=Flatten[Table[Select[FromDigits/@Table[ PadRight[ {}, n, {a, a+5}], {n, 2, nn}], PrimeQ], {a, 4}]]; w2=Flatten[Table[Select[ FromDigits/@ Table[PadRight[{}, n, {a+5, a}], {n, 2, nn}], PrimeQ], {a, 4}]]; Join[ {2, 3, 5, 7}, w1, w2]//Union] (* Harvey P. Dale, Jan 09 2021 *)
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Apr 15 1999
STATUS
approved