a(1) = 1, a(n) = smallest multiple of n such that the concatenation (n>1) a(n)a(n-1)... a(2) a(1) is a prime.

A089330

a(1) = 1, a(n) = smallest multiple of n such that the concatenation (n>1) a(n)a(n-1)... a(2) a(1) is a prime.

Terms

    a(0) =1a(1) =4a(2) =6a(3) =8a(4) =30a(5) =6a(6) =91a(7) =8a(8) =54a(9) =10a(10) =11a(11) =12a(12) =481a(13) =294a(14) =60a(15) =80a(16) =34a(17) =612a(18) =342a(19) =200a(20) =462a(21) =1606a(22) =644a(23) =1392a(24) =1425a(25) =1924a(26) =216a(27) =560a(28) =3219a(29) =120

External references