|
| |
|
|
A348548
|
|
Positive integers that are the product of two integers ending with 8.
|
|
1
|
|
|
|
64, 144, 224, 304, 324, 384, 464, 504, 544, 624, 684, 704, 784, 864, 944, 1024, 1044, 1064, 1104, 1184, 1224, 1264, 1344, 1404, 1424, 1444, 1504, 1584, 1624, 1664, 1744, 1764, 1824, 1904, 1944, 1984, 2064, 2124, 2144, 2184, 2204, 2224, 2304, 2384, 2464, 2484, 2544
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
Table of n, a(n) for n=1..47.
|
|
|
FORMULA
|
Lim_{n->infinity} a(n)/a(n-1) = 1.
|
|
|
EXAMPLE
|
64 = 8*8, 144 = 8*18, 224 = 8*28, 304 = 8*38, 324 = 18*18, 384 = 8*48, ...
|
|
|
MATHEMATICA
|
a={}; For[n=0, n<=260, n++, For[k=0, k<=n, k++, If[Mod[10*n+4, 10*k+8]==0 && Mod[(10*n+4)/(10*k+8), 10]==8 && 10*n+4>Max[a], AppendTo[a, 10*n+4]]]]; a
|
|
|
PROG
|
(Python)
def aupto(lim): return sorted(set(a*b for a in range(8, lim//8+1, 10) for b in range(a, lim//a+1, 10)))
print(aupto(2550)) # Michael S. Branicky, Oct 22 2021
|
|
|
CROSSREFS
|
Cf. A017317 (supersequence), A053742 (ending with 5), A139245 (ending with 2), A324297 (ending with 6), A346950 (ending with 3), A347253 (ending with 4), A348054 (ending with 7), A348549.
Sequence in context: A223063 A216330 A110232 * A188244 A044315 A044696
Adjacent sequences: A348545 A348546 A348547 * A348549 A348550 A348551
|
|
|
KEYWORD
|
nonn,base
|
|
|
AUTHOR
|
Stefano Spezia, Oct 22 2021
|
|
|
STATUS
|
approved
|
| |
|
|
