A105980 Near-repdigit primes with at least two 4's as the repeated digit.

443, 449, 4441, 4447, 44449, 444443, 444449, 444444443, 4444444447, 44444444441, 444444444443, 44444444444444444447, 44444444444444444444444447, 4444444444444444444444444441, 444444444444444444444444444443

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..26

Example

a(2)=449 is a term because all digits are equal to 4 except one.

Mathematica

Select[Flatten[Table[FromDigits[PadLeft[{n}, x, 4]], {x, 3, 30}, {n, {1, 3, 7, 9}}]], PrimeQ] (* Harvey P. Dale, Feb 18 2018 *)

Crossrefs

Cf. A105976, A105978, A107979, A105980, A105982, A365592, A365596, A365597, A365598.

Sequence in context: A098256 A225350 A171392 * A031519 A360827 A031699

Adjacent sequences: A105977 A105978 A105979 * A105981 A105982 A105983

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 29 2005

Extensions

More terms from Harvey P. Dale, Feb 18 2018

Name clarified by Robert Price, Sep 10 2023

Status

approved