A090853 a(n) is the least positive integer such that the arithmetic-geometric mean satisfies: floor( agm(a(n),a(n-2)) ) = a(n-1) for n>2, with a(1)=1, a(2)=2.

1, 2, 4, 7, 12, 19, 28, 40, 55, 73, 94, 118, 145, 176, 211, 250, 293, 340, 391, 446, 505, 568, 635, 706, 781, 860, 943, 1030, 1121, 1216, 1315, 1418, 1525, 1637, 1754, 1876, 2003, 2135, 2272, 2414, 2561, 2713, 2870, 3032, 3199, 3371, 3548, 3730, 3917, 4109

Offset

1,2

Links

Table of n, a(n) for n=1..50.

Crossrefs

Cf. A090852, A090854, A090855.

Sequence in context: A066699 A188425 A087149 * A333311 A266464 A103231

Adjacent sequences: A090850 A090851 A090852 * A090854 A090855 A090856

Keyword

nonn

Author

Paul D. Hanna, Dec 10 2003

Status

approved