a(n) is the index of the smallest prime whose digits sum to n-th prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =10a(5) =19a(6) =24a(7) =46a(8) =109a(9) =430a(10) =669a(11) =3245a(12) =6057a(13) =7837a(14) =33067a(15) =77777a(16) =476643a(17) =601855a(18) =3556550a(19) =5216954a(20) =15739663a(21) =41146179a(22) =189961757a(23) =882206624a(24) =3325059246a(25) =15581005618a(26) =23007498153a(27) =37607875618