A069324 Primes in A068949.

13, 19, 31, 43, 61, 67, 73, 79, 97, 103, 109, 127, 139, 157, 163, 181, 193, 199, 211

Offset

1,1

Comments

Differs from A040047 at the 13th term. - Kevin Buzzard (k.buzzard(AT)imperial.ac.uk), Jun 20 2008

Links

Table of n, a(n) for n=1..19.

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: A358530 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