Primefree Sequence - Other Sequences

Other Sequences

Several other primefree sequences are known:

a₁ = 331635635998274737472200656430763, a₂ = 1510028911088401971189590305498785 (sequence A083104 in OEIS; Graham 1964),

a₁ = 62638280004239857, a₂ = 49463435743205655 (sequence A083105 in OEIS; Knuth 1990), and

a₁ = 407389224418, a₂ = 76343678551 (sequence A082411 in OEIS; Nicol 1999).

The sequence of this type with the smallest known initial terms has

a₁ = 106276436867, a₂ = 35256392432 (Vsemirnov 2004).