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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Hugo Pfoertner, Table of n, a(n) for n = 1..500

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

Cf. A051217, A200440, A200506

Sequence in context: A261460 A061471 A112271 * A103076 A293029 A298761

Adjacent sequences:  A201119 A201120 A201121 * A201123 A201124 A201125

KEYWORD

nonn

AUTHOR

Hugo Pfoertner, Nov 27 2011

STATUS

approved

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Last modified August 26 00:35 EDT 2019. Contains 326324 sequences. (Running on oeis4.)