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