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