OFFSET
1,1
LINKS
Matthew House, Table of n, a(n) for n = 1..10000
EXAMPLE
95 = 19*5 is OK but 115 = 23*5 and 17*5 = 85 are not.
MAPLE
dmax:= 4: # to get all terms of up to dmax digits
S[1]:= [1, 3, 5, 7, 9]:
for d from 2 to dmax do
S[d]:= map(t -> seq(10*t+j, j=1..9, 2), S[d-1])
od:
T:= {seq(op(S[i]), i=1..dmax)} minus {1}:
R:= T intersect {seq(seq(T[i]*T[j], j=1..i), i=1..nops(T))}:
sort(convert(R, list)); # Robert Israel, Nov 22 2016
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Amarnath Murthy, Jun 01 2001
EXTENSIONS
More terms from Matthew Conroy, Jun 11 2001
Offset corrected by and more terms from Matthew House, Nov 22 2016
STATUS
approved