Carmichael numbers of the form (6*k + 1)*(12*k + 1)*(18*k + 1), where only two of the three numbers 6*k + 1, 12*k + 1, 18*k + 1 are prime.
A242980
Carmichael numbers of the form (6*k + 1)*(12*k + 1)*(18*k + 1), where only two of the three numbers 6*k + 1, 12*k + 1, 18*k + 1 are prime.
Terms
- a(0) =172081a(1) =1773289a(2) =4463641a(3) =47006785a(4) =295643089a(5) =798770161a(6) =1150270849a(7) =1420379065a(8) =1976295241a(9) =18390744505a(10) =122160500281a(11) =134642101321a(12) =215741809801a(13) =228944441089a(14) =263610459505a(15) =321140603665a(16) =374464040689a(17) =444722065201a(18) =676328168881
External references
- oeis: A242980