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A027664 as a simple table

na(n)
110000000
214142136
317320508
420000000
522360680
624494897
726457513
828284271
930000000
1031622777
1133166248
1234641016
1336055513
1437416574
1538729833
1640000000
1741231056
1842426407
1943588989
2044721360
2145825757
2246904158
2347958315
2448989795
2550000000
2650990195

[10000000,14142136,17320508,20000000,22360680,
 24494897,26457513,28284271,30000000,31622777,
 33166248,34641016,36055513,37416574,38729833,
 40000000,41231056,42426407,43588989,44721360,
 45825757,46904158,47958315,48989795,50000000,
 50990195]