Puzzle 1271 91997


On 3/26/2026 Sariyar sent the fillowing nice Curio & Challenge to the always interesting pages of my friend G. L. Honaker, Jr.

91997 is the largest prime number n such that after its digits respectively concatenated to the end of the preceding numbers beginning from n-1, all new numbers are prime, i.e., 919969, 919951, 919949, 919939, 919927 are all primes?


 
Q. Is there a larger example.