OFFSET
1,2
COMMENTS
Triangular numbers are (n*(n+1))/2 with n or n+1 twin prime
a(n)+a(n+1) is square: 1,4,9,16,25,36,121,144,289,324...
CROSSREFS
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Mar 10 2010
EXTENSIONS
Corrected definition and insert a comment Giovanni Teofilatto, Apr 13 2010
Corrected definition and extended Giovanni Teofilatto, Apr 14 2010
Missing numbers (35, 104 etc.) inserted by R. J. Mathar, Aug 23 2010
STATUS
approved