A004574 Expansion of sqrt(7) in base 7.

2, 4, 3, 4, 3, 3, 0, 6, 6, 5, 4, 2, 4, 6, 0, 3, 3, 2, 3, 3, 3, 2, 6, 1, 3, 6, 2, 4, 6, 6, 1, 5, 6, 6, 2, 3, 0, 4, 2, 2, 0, 0, 2, 3, 1, 3, 5, 2, 5, 2, 0, 6, 4, 4, 3, 1, 5, 6, 1, 4, 5, 1, 0, 6, 0, 2, 2, 3, 3, 2, 1, 3, 5, 5, 3, 5, 5, 4, 1, 6, 2, 1, 2, 2, 1, 5, 3, 5, 6, 0, 3, 5, 2, 0, 1, 0, 5, 1, 6

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• base
• cons

Links

• G. C. Greubel, Table of n, a(n) for n = 1..10000 (terms 1..2000 from Vincenzo Librandi)
• Jason Kimberley, Index of expansions of sqrt(d) in base b

Crossrefs

Cf. A010465.

Programs

Magma

Prune(Reverse(IntegerToSequence(Isqrt(7*7^200), 7))); // Vincenzo Librandi, Apr 28 2017

Mathematica

RealDigits[Sqrt[7], 7, 100][[1]] (* G. C. Greubel, Mar 25 2018 *)

Extensions

Updated by Alois P. Heinz at the suggestion of Kevin Ryde, Feb 19 2012