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A275547 as a simple table

na(n)
12
240
346
448
550
67960
77962
87984
97986
108808
118810
128812
138816
148822
158824
168826
178828
188830
198836
208844
218846
228848
238850
248854
258856
268858
278860
288862
298864
308866
318872
328878
338970
348972
358974
369064
379078
389080
399082
409084
419086
429088
439096
449164
459220

[2,40,46,48,50,7960,7962,7984,7986,8808,8810,8812,
 8816,8822,8824,8826,8828,8830,8836,8844,8846,8848,
 8850,8854,8856,8858,8860,8862,8864,8866,8872,8878,
 8970,8972,8974,9064,9078,9080,9082,9084,9086,9088,
 9096,9164,9220]