1,1

Each prime contains one 1 and k 9's. Corresponding k's are: 1,2,2,2,3,3,4,5,5,5,6,7,7,9,10,10,11,11,12,13,13,14,14,14,15,16,16,16,18,18,18,19,19,21,21,21,22,23,23,23,24,24,25,25,26,26,26,26,26,26,27,27,28,29,29,30,30

A007953, A055558.

Sequence in context: A141995 A097445 A058370 this_sequence A066007 A147830 A135162

Adjacent sequences: A164887 A164888 A164889 this_sequence A164891 A164892 A164893

base,nonn

Zak Seidov (zakseidov(AT)yahoo.com), Aug 29 2009