A008568 Digits of powers of 7.

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

Offset

0,2

Comments

Irregular table with row length sequence A210062. - Jason Kimberley, Nov 26 2012

The constant whose decimal expansion is this sequence is irrational (Mahler, 1981). - Amiram Eldar, Mar 23 2025

Links

Seiichi Manyama, Rows n = 0..100, flattened

Kurt Mahler, On some irrational decimal fractions, Journal of Number Theory, Vol. 13, No. 2 (1981), pp. 268-269.

Example

Triangle begins:
  1;
  7;
  4, 9;
  3, 4, 3;
  2, 4, 0, 1;
  1, 6, 8, 0, 7;
  1, 1, 7, 6, 4, 9;
  8, 2, 3, 5, 4, 3;
  ...

Mathematica

Flatten[IntegerDigits[7^Range[0, 20]]]  (* Harvey P. Dale, Mar 03 2011 *)

Crossrefs

Cf. A000420, A210062.

Cf. A000455, A008564, A008565, A008566, A008567, A008569, A008570, A008571, A008572, A008573, A010054.

Sequence in context: A242909 A259147 A178768 * A019795 A200305 A199448

Adjacent sequences: A008565 A008566 A008567 * A008569 A008570 A008571

Keyword

nonn,base,easy,tabf

Author

N. J. A. Sloane

Status

approved