OFFSET
1,1
COMMENTS
a(n) = n only for 2,4,7?
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Dec 11 2009
EXTENSIONS
Extended beyond a(25) by R. J. Mathar, Jan 30 2010
Name clarified by Jason Kimberley, Jul 02 2018
STATUS
approved