Numbers k such that k-1, k+1, 2*k-1, 2*k+1, 3*k-1 and 3*k+1 are primes.

Terms

a(0) =6a(1) =53550a(2) =420420a(3) =422310a(4) =1624350a(5) =2130240a(6) =3399900a(7) =5199810a(8) =5246010a(9) =6549270a(10) =7384440a(11) =7775880a(12) =9516570a(13) =9565710a(14) =10430280a(15) =11845260a(16) =13207950a(17) =14562870a(18) =14619990a(19) =18747960a(20) =20099940a(21) =21596820a(22) =21968100a(23) =24358950a(24) =24610740a(25) =26916120a(26) =28359240a(27) =30838080