This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A039242 Numbers n such that representation in base 12 has same number of 3's and 7's. 0
 0, 1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 32, 33, 34, 35, 43, 48, 49, 50, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 64, 65, 66, 68, 69, 70, 71, 72, 73, 74, 76, 77, 78, 80, 81, 82, 83, 87, 96, 97, 98, 100, 101, 102, 104 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS MATHEMATICA Select[Range[0, 120], DigitCount[#, 12, 3]==DigitCount[#, 12, 7]&] (* Harvey P. Dale, May 04 2011 *) PROG (PARI) helkustinda(n, {B=10}, {w=[]})={my(L=List(), c, s=vector(B), wo=Set(w)); if(1<#wo, for(t=1, (-1+#wo), s[1+wo[t]]--); s[1+wo[#wo]]=-1+#wo; ); for(k=1, +oo, forvec(y=vector(k, u, [((k!=1)&&(u==1)), B-1]), if(c(x==3), d) == #select(x->(x==7), d); \\ Michel Marcus, Feb 05 2019 CROSSREFS Cf. A039138 (same in base 10). Sequence in context: A059921 A062289 A172284 * A039185 A080240 A135668 Adjacent sequences:  A039239 A039240 A039241 * A039243 A039244 A039245 KEYWORD nonn,base,easy AUTHOR 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 December 14 05:36 EST 2019. Contains 329978 sequences. (Running on oeis4.)