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

Author

Shyam Sunder Gupta, Apr 29 2005

Keywords

• base
• nonn

Examples

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

Links

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

Crossrefs

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

Programs

Mathematica

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

Extensions

More terms from Harvey P. Dale, Feb 18 2018

Name clarified by Robert Price, Sep 10 2023