OFFSET
1,1
FORMULA
Lim_{n->infinity} a(n)/a(n-1) = 1.
EXAMPLE
16 = 4*4, 56 = 4*14, 96 = 4*24, 136 = 4*34, 176 = 4*44, 196 = 14*14, 216 = 4*54, ...
MATHEMATICA
a={}; For[n=0, n<=200, n++, For[k=0, k<=n, k++, If[Mod[10*n+6, 10*k+4]==0 && Mod[(10*n+6)/(10*k+4), 10]==4 && 10*n+6>Max[a], AppendTo[a, 10*n+6]]]]; a
PROG
(Python)
def aupto(lim): return sorted(set(a*b for a in range(4, lim//4+1, 10) for b in range(a, lim//a+1, 10)))
print(aupto(1660)) # Michael S. Branicky, Aug 24 2021
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Stefano Spezia, Aug 24 2021
STATUS
approved