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A055877 as a simple table

na(n)
11
22
35
46
542
643
718626
818627
95798368522871
105798368522872
11194935493755610196550803104551677768964
12194935493755610196550803104551677768965

[1,2,5,6,42,43,18626,18627,5798368522871,
 5798368522872,
 194935493755610196550803104551677768964,
 194935493755610196550803104551677768965]