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URL: https://oeis.org/A120820

⇱ A120820 - OEIS

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A120820
a(n) consecutive digits ascending beginning with the digit 2 give a prime.
8
1, 2, 8, 82, 118, 158, 2122, 2242, 2388
OFFSET
1,2
COMMENTS
Digits are in ascending order beginning with 2 and after 9 comes 0.
The sequence "a(n) consecutive digits descending beginning with the digit 2 give a prime" has only one term, 1 which represents the prime 2.
a(10) > 10^5. - Michael S. Branicky, Apr 10 2025
EXAMPLE
8 is a term since 23456789 is a prime.
MATHEMATICA
fQ[n_] := PrimeQ@ FromDigits@ Mod[1+Range@n, 10]; lst = {}; Do[ If[fQ@n, AppendTo[lst, n]; Print@n], {n, 10000}]; lst
KEYWORD
nonn,base,hard,more
AUTHOR
Robert G. Wilson v, Jul 05 2006
STATUS
approved