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A201122
Differences between odd powers of 6 and the next smaller square
2
2, 20, 32, 95, 3420, 8847, 89927, 494576, 1347932, 48525552, 265807127, 682379927, 3237653360, 52571448911, 356954431580, 1333226567615, 6534477744687, 69394484050880, 10500704463815, 378025360697340, 13608912985104240, 60046182811381232, 227226500274052935, 442409686123219952, 15926748700435918272
OFFSET
1,1
LINKS
FORMULA
a(n)=6^(2*n-1) - floor(sqrt(6^(2*n-1)))^2
EXAMPLE
a(1)=6^1-2^2=2, a(2)=6^3-14^2=216-196=20, a(3)=6^5-88^2=7776-7744=32
MATHEMATICA
#-Floor[Sqrt[#]]^2&/@(6^Range[1, 51, 2]) (* Harvey P. Dale, Aug 12 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Nov 27 2011
STATUS
approved