a(1) = 7; 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-1). Alternate left and right concatenation yielding primes.
A069619
a(1) = 7; 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-1). Alternate left and right concatenation yielding primes.
Terms
- a(0) =7a(1) =71a(2) =271a(3) =2711a(4) =52711a(5) =5271121a(6) =135271121a(7) =1352711219a(8) =271352711219
External references
- oeis: A069619