,
(
300
600
900
1200
1500
1800
2100
2400
2700
3000
)
1
...
279
280
281
282
283
284
285
286
287
288
289
290
291
...
1233
-
(3-7 ) ­ , , ( )
1. (an) a1 =3, an+1=an+4. a10
1_ , .
.
, , ,
:
-
,
-
# (2018)
" "
1
...
279
280
281
282
283
284
285
286
287
288
289
290
291
...
1233
: