a(1) = 9; a(2n) = smallest prime that is a right concatenation of a(2n-1) and a number with no insignificant zeros and a(2n+1) = smallest prime ending in ( the least significant digits) a(2n). Alternate left and right concatenation yielding primes.
A069621
a(1) = 9; a(2n) = smallest prime that is a right concatenation of a(2n-1) and a number with no insignificant zeros and a(2n+1) = smallest prime ending in ( the least significant digits) a(2n). Alternate left and right concatenation yielding primes.
Terms
- a(0) =9a(1) =97a(2) =197a(3) =1973a(4) =31973a(5) =319733a(6) =3319733a(7) =331973311a(8) =6331973311a(9) =633197331131
External references
- oeis: A069621