登录

A177916号作为一个简单的表

n个a(n)
11
2
5
415
521
639
755
857
9105
10111
11155
12165
13195
14205
15219
16273
17285
18327
19399
20465
21505
22555
23609
24615
25741
26777
27903
28915
291095
301155
311255
321265
331365
341443
351515
361533
371635
381705
391995
402067
412109
422145
432255
442265
452289
462373
472667
482715
492847

[1,3,5,15,21,39,55,57,105,111,155,165,195,205,219,273,285,327,399,465,505,555,609,615,741,777,903,915,1095,1155,1255,1265,1365,1443,1515,1533,1635,1705,1995,2067,2109,2145,2255,2265,2289,2373,2667,2715,2847]