A105975 Near-repdigit primes with 9 as repeated digit.

199, 499, 599, 919, 929, 991, 997, 1999, 2999, 4999, 8999, 9199, 9929, 9949, 49999, 59999, 79999, 94999, 98999, 99929, 99989, 99991, 199999, 599999, 799999, 989999, 991999, 999199, 999499, 999599, 999959, 999979, 2999999, 4999999, 9899999

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Brady Haran and Simon Pampena, Glitch Primes and Cyclops Numbers, Numberphile video (2015)

Example

a(2)=499 is a term because all digits are equal to 9 except one.

Mathematica

Sort[Select[Flatten[Table[FromDigits/@(Flatten[Permutations/@Table[ Join[{n}, PadRight[{}, i, 9]], {n, {1, 2, 4, 5, 7, 8}}], 1]), {i, 2, 6}]], PrimeQ]] (* Harvey P. Dale, May 07 2015 *)

Crossrefs

Sequence in context: A227284 A140632 A142814 * A095995 A358898 A159657

Adjacent sequences: A105972 A105973 A105974 * A105976 A105977 A105978

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 29 2005

Status

approved