Numbers k such that k^2 - 1 and k^2 + 1 have 6 divisors each.

Terms

a(0) =168a(1) =1368a(2) =97968a(3) =10374840a(4) =16104168a(5) =44049768a(6) =68674368a(7) =100741368a(8) =281803368a(9) =486775968a(10) =1177381968a(11) =1262878368a(12) =1336852968a(13) =2321986968a(14) =2404627368a(15) =3476635368a(16) =4374102768a(17) =5102102040a(18) =5142754368a(19) =5182128168a(20) =5385651768a(21) =6035269968a(22) =9218496168a(23) =10657878168