A023966 - OEIS

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A023966

First digit after decimal point of 7th root of n.

0, 1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9

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

OFFSET

1,4

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

Array[ Function[ n, RealDigits[ N[ Power[ n, 1/7 ], 10 ], 10 ]// (#[ [ 1, #[ [ 2 ] ]+1 ] ])& ], 110 ]

fd7[n_]:=Module[{rd=RealDigits[Surd[n, 7], 10, 20], a, b}, a=rd[[1]]; b=rd[[2]]; a[[b+1]]]; Array[fd7, 110] (* Harvey P. Dale, Jun 21 2016 *)

CROSSREFS

Sequence in context: A317359 A375423 A108229 * A368942 A373813 A088141

Adjacent sequences: A023963 A023964 A023965 * A023967 A023968 A023969

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Olivier Gérard

STATUS

approved