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

1,1

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.

Mathematica

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

Crossrefs

Cf. A000396, A030291, A048517.

Sequence in context: A230202 A037029 A048517 * A043416 A125680 A162238

Adjacent sequences: A048515 A048516 A048517 * A048519 A048520 A048521

Keyword

nonn,base

Author

Patrick De Geest, May 15 1999

Extensions

More terms from Naohiro Nomoto, Jul 28 2001

Offset corrected by Sean A. Irvine, Jun 20 2021

Status

approved