A178467 a(n) = n * (number of letters in n in Italian).

0, 3, 6, 9, 28, 30, 18, 35, 32, 36, 50, 66, 72, 91, 154, 120, 96, 187, 144, 190, 100, 147, 176, 184, 288, 275, 208, 270, 224, 261, 180, 248, 288, 297, 442, 420, 324, 407, 342, 390, 320, 410, 462, 473, 660, 630, 506, 611, 528, 588, 450, 561, 624, 636, 864, 825, 672, 798, 696, 767, 480, 610, 682, 693, 960, 910, 726, 871, 748, 828, 560, 710, 792, 803, 1110, 1050, 836, 1001, 858, 948, 560, 729, 820, 830, 1176, 1105, 860, 1044

Offset: 0

Author

Carmine Suriano, Dec 23 2010

Keywords

• nonn
• word

Comments

a(0) and a(3) are the only terms such that a(k) = k^2.

Examples

			a(5)=30 since 5="cinque" has 6 letters in Italian and 5*6=30.
a(81)=729 since 81="ottantuno" has 9 letters.
		

Crossrefs

Cf. A001477, A026858.

Formula

a(n) = A001477(n)*A026858(n).

Extensions

Edited by N. J. A. Sloane, Dec 23 2010

a(81) corrected by Georg Fischer, Apr 11 2024