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A151969 as a simple table

na(n)
11
22
34
44
55
68
78
88
910
1010
1116
1216
1316
1416
1516
1616
1720
1820
1920
2020
2125
2225
2325
2425
2525
2632
2732
2832
2932
3032
3132
3232
3340
3440
3540
3640
3740
3840
3940
4040
4150
4250
4350
4450
4550
4650
4750
4850
4950
5050
5164
5264
5364
5464
5564
5664
5764
5864
5964
6064
6164
6264
6364
6464
6580
6680
6780
6880
6980

[1,2,4,4,5,8,8,8,10,10,16,16,16,16,16,16,20,20,20,
 20,25,25,25,25,25,32,32,32,32,32,32,32,40,40,40,
 40,40,40,40,40,50,50,50,50,50,50,50,50,50,50,64,
 64,64,64,64,64,64,64,64,64,64,64,64,64,80,80,80,
 80,80]