A180398 Integers n that are a multiple of the number of letters in n in Italian.
3, 6, 8, 10, 12, 20, 21, 24, 30, 36, 40, 66, 81, 84, 99, 100, 108, 110, 120, 153, 176, 180, 187, 200, 238, 240, 266, 288, 342, 390, 391, 396, 399, 414, 437, 440, 456, 460, 494, 504, 552, 570, 572, 575, 588, 600, 616, 629, 630, 640, 644, 646, 690, 700, 702, 714
Offset: 1
Examples
a(5)=12 since 12 ("dodici" has 6 letters) is a multiple of 6.
Crossrefs
Cf. A026852