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

0,2

Links

Table of n, a(n) for n=0..23.

Formula

floor( agm(a(n), 1) ) = 3^n, for n>=0.

Crossrefs

Cf. A090852, A090854, A090857.

Sequence in context: A185080 A006350 A054485 * A055917 A056120 A255278

Adjacent sequences: A090853 A090854 A090855 * A090857 A090858 A090859

Keyword

nonn

Author

Paul D. Hanna, Dec 10 2003

Status

approved