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!)
 A069324 Primes in A068949. 4
 13, 19, 31, 43, 61, 67, 73, 79, 97, 103, 109, 127, 139, 157, 163, 181, 193, 199, 211 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Differs from A040047 at the 13th term. - Kevin Buzzard (k.buzzard(AT)imperial.ac.uk), Jun 20 2008 LINKS EXAMPLE a(4)=43 since the fourth prime in A068949 is 43. PROG (PARI) disum(n)= { local(resul) ; resul=0 ; while(n>0, resul += n%10 ; n = (n-n%10)/10 ; ) ; return(resul) ; } A069324(maxs)= { local(ssqu, su) ; su=1 ; for(s=1, maxs, ssqu=s^2 ; if (disum(ssqu) > su, su=disum(ssqu) ; if( isprime(su), print1(su, ", ") ; ) ; ) ; ) ; } A069324(200000000) ; - R. J. Mathar, May 19 2006 CROSSREFS Cf. A068809, A068949, A068952, A040047. Sequence in context: A244311 A164333 A182365 * A040047 A163847 A051644 Adjacent sequences:  A069321 A069322 A069323 * A069325 A069326 A069327 KEYWORD more,nonn,base AUTHOR Francois Jooste (phukraut(AT)hotmail.com), Mar 15 2002 EXTENSIONS a(12) from R. J. Mathar, May 19 2006 a(13)-a(14) from Kevin Buzzard (k.buzzard(AT)imperial.ac.uk), Jun 20 2008 a(15)-a(19) from Giovanni Resta, Jun 27 2018 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 15 09:05 EST 2019. Contains 329995 sequences. (Running on oeis4.)