A247148 - OEIS

%I #15 Apr 03 2023 10:36:13

%S 2,5,108947,4940867

%N Primes p that divide LS(p), where LS is the "Look and Say" function (A045918).

%C a(5) > 4*10^12. - _Tyler Busby_, Feb 02 2023

%H Chris K. Caldwell and G. L. Honaker, <a href="https://t5k.org/curios/page.php?short=108947">Prime Curio for 108947</a>

%e a(2)=5, because 5 is prime and divides LS(5) or 15.

%Y Cf. A000040, A045918, A079342.

%K nonn,more,hard,base

%O 1,1

%A _G. L. Honaker, Jr._, Nov 20 2014

%E a(4) from _Alois P. Heinz_, Nov 20 2014