Numbers k such that k+1, k-1, k/2+1, k/2-1, k/3+1 and k/3-1 are all prime.

Terms

a(0) =12a(1) =540540a(2) =928620a(3) =960120a(4) =9074520a(5) =10199700a(6) =26460000a(7) =44186940a(8) =46787580a(9) =66459960a(10) =67723740a(11) =71901900a(12) =94884300a(13) =98698320a(14) =109495260a(15) =115796520a(16) =126556920a(17) =134276940a(18) =140943600a(19) =157861620a(20) =196226100a(21) =197520120a(22) =202498380