A048518 Primes containing only two distinct digits whose sum of digits is 28, the second perfect number.

1999, 9199, 338383, 383833, 1181881, 1881181, 1881811, 2222929, 2922229, 8118181, 8188111, 8881111, 9222229, 15551551, 15555151, 15555511, 16166611, 16616161, 33333373, 33733333, 34434343, 44334343, 44343433, 51155551, 51515551, 55155151, 55155511, 55515151

Offset: 1

Author

Patrick De Geest, May 15 1999

Keywords

• nonn
• base

Comments

Calculated by Robert T. McQuaid (robert.mcquaid(AT)headwaters.com).

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..21755 (first 200 terms from Sean A. Irvine)
• C. Rivera, Source from Carlos Rivera's Puzzle Site.

Crossrefs

Cf. A000396, A030291, A048517.

Programs

Mathematica

Select[Prime[Range[3100000]],Count[DigitCount[#],0]==8&&Total[ IntegerDigits[ #]]==28&] (* Harvey P. Dale, Jun 11 2016 *)

Extensions

More terms from Naohiro Nomoto, Jul 28 2001

Offset corrected by Sean A. Irvine, Jun 20 2021