A208272 - OEIS

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A208272

Primes containing a digit 2.

2, 23, 29, 127, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 421, 521, 523, 727, 821, 823, 827, 829, 929, 1021, 1123, 1129, 1201, 1213, 1217, 1223, 1229, 1231, 1237, 1249, 1259, 1277, 1279, 1283, 1289, 1291, 1297, 1321, 1327

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Supersequence of A045708. Subsequence of A011532.

Complement of A208273 with respect to A011532.

Also primes p whose divisors d_k (k = 1, 2; 1 = d_1 < d_2 = p) contain digit equal to number k.

Complement of A208275 with respect to A208274.

Primes with at least one digit equal to 2. - Harvey P. Dale, Aug 29 2012

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

FORMULA

a(n) ~ n log n. - Charles R Greathouse IV, Nov 01 2022

MATHEMATICA

Select[Range[2000], PrimeQ[#] && MemberQ[IntegerDigits[#], 2] &] (* T. D. Noe, Mar 06 2012 *)

Select[Prime[Range[300]], DigitCount[#, 10, 2]>0&] (* Harvey P. Dale, Aug 29 2012 *)

CROSSREFS

Cf. A208273 (composites containing a digit 2), A011532 (numbers containing a digit 2).

Sequence in context: A084373 A107148 A062653 * A306086 A045708 A090150

Adjacent sequences: A208269 A208270 A208271 * A208273 A208274 A208275

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Mar 04 2012

STATUS

approved