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A083748
Star numbers (A003154) whose digital sum and product of nonzero digits are both triangular numbers.
0
1, 37, 73, 433, 15301, 39853, 66781, 78661, 110161, 146953, 156493, 202033, 220033, 305101, 355753, 416593, 509833, 593461, 805933, 1011061, 1503001, 1563661, 2952613, 4000033, 4019653, 4609513, 5262193, 6211837, 6359221, 6608701
OFFSET
1,2
EXAMPLE
a(2)=37 because
........()........
.......()().......
..()()()()()()()..
...()()()()()()...
....()()()()()....
...()()()()()()...
..()()()()()()()..
.......()().......
........()........
and 3+7 is
....()....
...()()...
..()()()..
.()()()().
and 3*7 is
......()......
.....()().....
....()()()....
...()()()()...
..()()()()()..
.()()()()()().
CROSSREFS
Sequence in context: A153208 A128388 A137833 * A146273 A146241 A217386
KEYWORD
base,nonn
AUTHOR
Jason Earls, Jun 17 2003
STATUS
approved