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

0,2

Comments

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

Links

Table of n, a(n) for n=0..87.

Formula

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

Example

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.

Sequence in context: A067862 A062927 A349597 * A193802 A254616 A195205

Adjacent sequences: A178464 A178465 A178466 * A178468 A178469 A178470

Keyword

nonn,word

Author

Carmine Suriano, Dec 23 2010

Extensions

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

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

Status

approved