Table of n, a(n) for n=1..7.
71 is in the sequence because it is the 20th prime (pi(71)=20) and the decimal expansion of 71/20=3,55 has only prime digits.
Sequence in context: A038930 A019375 A078784 * A304811 A064739 A112860
Adjacent sequences: A117193 A117194 A117195 * A117197 A117198 A117199
Luc Stevens (lms022(AT)yahoo.com), Apr 21 2006