0,1

343 = 7^3; 3 digits in 343, 2 digits in 7^3, so 343 is economical.

Cf. A046759.

Sequence in context: A045269 A043395 A117689 this_sequence A052084 A075546 A167733

Adjacent sequences: A047736 A047737 A047738 this_sequence A047740 A047741 A047742

nonn

Carlos B. Rivera (crivera(AT)primepuzzles.net)