A094128 Numbers n that can be factorized n=x*y and containing in their ternary representation the same digits the same number of times as x and y together.

44, 116, 128, 132, 152, 296, 320, 332, 344, 348, 380, 384, 396, 440, 452, 456, 464, 476, 800, 872, 880, 888, 944, 960, 980, 992, 996, 1024, 1028, 1032, 1044, 1136, 1140, 1152, 1184, 1188, 1196, 1232, 1280, 1304, 1316, 1320, 1352, 1356, 1368

Offset

1,1

Links

Table of n, a(n) for n=1..45.

J. K. Andersen, Vampire Numbers

Eric Weisstein's World of Mathematics, Vampire Number

Eric Weisstein's World of Mathematics, Ternary

Example

320=16*20, 320->'102212' with 1x'0', 2x'1' and 3x'2': 16->'121' and 20->'202' have together the same ternary digits the same number of times, therefore 320 is a term.

Crossrefs

Cf. A020342, A048936, A007089.

Sequence in context: A258555 A258548 A036198 * A340178 A268396 A245616

Adjacent sequences: A094125 A094126 A094127 * A094129 A094130 A094131

Keyword

nonn,base

Author

Reinhard Zumkeller, Jun 01 2004

Status

approved