

A155816


First nonzero digit in the decimal expansion of (cos Pi/4)^n


0



7, 5, 3, 2, 1, 1, 8, 6, 4, 3, 2, 1, 1, 7, 5, 3, 2, 1, 1, 9, 6, 4, 3, 2, 1, 1, 8, 6, 4, 3, 2, 1, 1, 7, 5, 3, 2, 1, 1, 9, 6, 4, 3, 2, 1, 1, 8, 5, 4, 2, 2, 1, 1, 7, 5, 3, 2, 1, 1, 9, 6, 4, 3, 2, 1, 1, 8, 5, 4, 2, 2, 1, 1, 7, 5, 3, 2, 1, 1, 9, 6, 4, 3, 2, 1, 1
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OFFSET

0,1


LINKS

Table of n, a(n) for n=0..85.


EXAMPLE

(cos Pi/4)^4=0.25, so a(4)=2. (cos Pi/4)^8=0.0625, so a(8)=6


MATHEMATICA

With[{c=Cos[Pi/4]}, Table[First[RealDigits[N[c^n, 20]][[1]]], {n, 120}]] (* Harvey P. Dale, Nov 07 2012 *)


CROSSREFS

Sequence in context: A180597 A219242 A330920 * A308414 A335985 A093824
Adjacent sequences: A155813 A155814 A155815 * A155817 A155818 A155819


KEYWORD

nonn,base


AUTHOR

Avik Roy (avik_3.1416(AT)yahoo.co.in), Jan 28 2009


EXTENSIONS

More terms from Harvey P. Dale, Nov 07 2012


STATUS

approved



