%I #11 May 06 2022 13:13:51
%S 1,2,3,4,5,6,7,8,9,32,0,13,0,52,23,62,0,33,0,14,43,92,0,24,0,0,63,34,
%T 0,15,0,44,83,0,25,54,0,0,0,35,0,16,0,74,45,0,0,26,0,55,0,94,0,36,65,
%U 17,0,0,0,46,0,0,27,422,85,56,0,0,0,37,0,18,0,0,0,0,47,76,0,28,603,0,0,57,0,0,0,38,0,19
%N Smallest k such that A349278(k) = n, or 0 if no such k exists.
%C Composite numbers m for which a(m) = 0 are in A349865.
%F If p prime >= 11, a(p) = 0.
%e a(10) = 32 since 2*(2+3) = 10 and no integer du < 32 gives u*(u+d) = 32.
%Y Cf. A349278, A349865.
%Y Cf. A349732 (similar, with first digits).
%K nonn,base
%O 1,2
%A _Bernard Schott_, Dec 03 2021
%E a(64) and a(81) corrected by _Michel Marcus_, Dec 03 2021.