A090856 a(n) is the least positive integer such that the integer part of the arithmetic-geometric mean of a(n) and 1 is equal to 3^n.
1, 7, 27, 104, 378, 1327, 4553, 15351, 51072, 168147, 548915, 1779377, 5734022, 18384612, 58688163, 186632570, 591509670, 1869118923, 5890466415, 18518945789, 58094637801, 181884111404, 568416743474, 1773443888599
Offset: 0
Keywords
Formula
floor( agm(a(n), 1) ) = 3^n, for n>=0.