A178552 Primes with exactly three 3's.

2333, 3313, 3323, 3331, 3343, 3373, 3433, 3533, 3733, 3833, 5333, 7333, 10333, 13033, 13313, 13331, 13337, 13339, 13633, 13933, 16333, 17333, 19333, 20333, 23339, 23633, 23833, 29333, 30133, 30313, 30323, 31033, 31337, 31393, 32233, 32303, 32323, 32353, 32363, 32533

Offset: 1

Author

Lekraj Beedassy, May 29 2010

Keywords

• nonn
• base
• changed

Links

• Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A038618, A178550, A178551, A178553-A178558.

Programs

Mathematica

Select[Prime[Range[3500]],Count[IntegerDigits[#],3]==3 &] (* Stefano Spezia, Aug 29 2025 *)

Extensions

Missing a(26) = 23633 and a(27) = 23833 inserted by Daniel Starodubtsev, Mar 14 2020