OFFSET
1,1
COMMENTS
Primitive dimensions of Hadamard matrices which cannot be obtained as tensor powers of the primitive matrix 2 X 2 {{1,1},{1,-1}}.
5+7=12=2+4+6, 9+11=20=2+4+6+8,.. Numbers that can be expressed as sum of two or more positive consecutive odd numbers AND as sums of two or more positive consecutive even numbers. - Vladimir Joseph Stephan Orlovsky, May 11 2010
Nicomachus called these numbers "odd-times even". - Eric M. Schmidt, Mar 30 2019
LINKS
Nicomachus, Introduction to Arithmetic, Book I, Chapter X.
MATHEMATICA
a = {}; Do[k = 4n; If[Round[Log[k]/Log[2]] == Log[k]/Log[2], [null], AppendTo[a, k]], {n, 1, 100}]; a
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Jan 19 2008
STATUS
approved