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A168350
Sum of first n non-single or nonisolated numbers.
0
0, 1, 4, 9, 16, 24, 33, 43, 54, 67, 81, 96, 112, 129, 148, 168, 189, 211, 235, 260, 286, 313, 341, 370, 401, 433, 466, 500, 535, 571, 609, 648, 688, 729, 772, 816, 861, 907, 955, 1004, 1054, 1105, 1157, 1211, 1266, 1322, 1379, 1437, 1496, 1557, 1619, 1682
OFFSET
1,3
FORMULA
a(n)=sum{j=1..n} A167707(j).
EXAMPLE
a(1)=0, a(2)=0+1=1, a(3)=0+1+3=4.
CROSSREFS
Cf. A167707.
Sequence in context: A320891 A161697 A078593 * A281151 A337722 A052117
KEYWORD
nonn
AUTHOR
EXTENSIONS
Formula and A-number corrected and entries checked by R. J. Mathar, Nov 24 2009
STATUS
approved