a(n) = min {i - j} where i*j is a factorization of the n-th partial product of the semiprimes (A112141).

A317490

a(n) = min {i - j} where i*j is a factorization of the n-th partial product of the semiprimes (A112141).

Terms

    a(0) =0a(1) =2a(2) =6a(3) =3a(4) =12a(5) =3a(6) =126a(7) =153a(8) =765a(9) =1050a(10) =5348a(11) =14850a(12) =85050a(13) =501200a(14) =91280a(15) =3661983a(16) =25633881a(17) =66271296a(18) =215467945a(19) =254861640a(20) =5311480020a(21) =75327142968a(22) =122703152000

External references