The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A156343 Primes with equal number of prime and nonprime digits. 0
 13, 17, 29, 31, 43, 47, 59, 67, 71, 79, 83, 97, 1033, 1123, 1153, 1213, 1217, 1229, 1231, 1259, 1279, 1283, 1297, 1303, 1307, 1321, 1367, 1423, 1427, 1433, 1453, 1531, 1543, 1559, 1567, 1571, 1579, 1583, 1597, 1627, 1637, 1657, 1721, 1747, 1759, 1783, 1787 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Prime digits are 2, 3, 5 or 7. Nonprime digits are 0, 1, 4, 6, 8 or 9. Complement of (A154385 U A154386). [Juri-Stepan Gerasimov, Nov 29 2009] LINKS EXAMPLE 13 (1=nonprime, 3=prime) = a(1). MAPLE A109066c := proc(n) nops(convert(n, base, 10))-A109066(n) ; end: A109066 := proc(n) local dgs, a ; dgs := convert(n, base, 10) ; a := 0 ; for i in dgs do if isprime(i) then a := a+1 ; fi; od: a ; end: for i from 1 to 400 do p := ithprime(i) ; if A109066(p) = A109066c(p) then printf("%d, ", p) ; fi; od: # R. J. Mathar, Feb 09 2009 CROSSREFS Cf. A000040. Sequence in context: A179909 A220488 A092626 * A154762 A079348 A174024 Adjacent sequences:  A156340 A156341 A156342 * A156344 A156345 A156346 KEYWORD nonn,base AUTHOR Juri-Stepan Gerasimov, Feb 08 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 11 16:26 EDT 2021. Contains 343798 sequences. (Running on oeis4.)