OFFSET
1,2
FORMULA
a(n) = (A346950(n) - 9)/10.
Lim_{n->infinity} a(n)/a(n-1) = 1.
EXAMPLE
15 is a term because 3*53 = 159 = 15*10 + 9.
MATHEMATICA
a={}; For[n=0, n<=150, n++, For[k=0, k<=n, k++, If[Mod[10*n+9, 10*k+3]==0 && Mod[(10*n+9)/(10*k+3), 10]==3&& 10*n+9>Max[10a+9], AppendTo[a, n]]]]; a
PROG
(Python)
def aupto(lim): return sorted(set(a*b//10 for a in range(3, 10*lim//3+4, 10) for b in range(a, 10*lim//a+4, 10) if a*b//10 <= lim))
print(aupto(150)) # Michael S. Branicky, Aug 11 2021
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Stefano Spezia, Aug 08 2021
STATUS
approved