1,3

Table of n, a(n) for n=1..68.

81 is not a term because in 81^3 = 531441 the two digits 1 are separated by the two 4's.

15 is a term because in 15^3 = 3375 the digits 3, 7 and 5 are grouped.

Cf. A052084, A052085, A052086, A052081, A052082.

Sequence in context: A174788 A129143 A039225 * A192188 A039268 A039162

Adjacent sequences: A052080 A052081 A052082 * A052084 A052085 A052086

nonn,base

Patrick De Geest, Jan 15 2000

Edited, and offset changed to 1, by Jon E. Schoenfield, Oct 17 2019

approved