A083748 Star numbers (A003154) whose digital sum and product of nonzero digits are both triangular numbers.

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

Links

Table of n, a(n) for n=1..30.

Example

a(2)=37 because
........()........
.......()().......
..()()()()()()()..
...()()()()()()...
....()()()()()....
...()()()()()()...
..()()()()()()()..
.......()().......
........()........
and 3+7 is
....()....
...()()...
..()()()..
.()()()().
and 3*7 is
......()......
.....()().....
....()()()....
...()()()()...
..()()()()()..
.()()()()()().

Crossrefs

Sequence in context: A153208 A128388 A137833 * A146273 A146241 A217386

Adjacent sequences: A083745 A083746 A083747 * A083749 A083750 A083751

Keyword

base,nonn

Author

Jason Earls, Jun 17 2003

Status

approved