A061519 - OEIS

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A061519

a(0) = 1; a(n) is obtained by incrementing each digit of a(n-1) by 5.

1, 6, 11, 66, 1111, 6666, 11111111, 66666666, 1111111111111111, 6666666666666666, 11111111111111111111111111111111, 66666666666666666666666666666666

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OFFSET

0,2

COMMENTS

In A061511-A061522, A061746-A061750 when the incremented digit exceeds 9 it is written as a 2-digit string. So 9+1 becomes the 2-digit string 10, etc.

Number of digits of each term is the sequence A016116. [From Dmitry Kamenetsky, Jan 17 2009]

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..13

FORMULA

a(2n) = 6*[10^{2^(n)} - 1]/9 a(2n+1) = [10^(2^n) - 1]/9

MATHEMATICA

With[{nn=5}, Join[Table[FromDigits[PadRight[{}, 2^n, 1]], {n, 0, nn}], Table[FromDigits[PadRight[{}, 2^n, 6]], {n, 0, nn}]]]//Sort (* Harvey P. Dale, Jan 23 2025 *)

CROSSREFS

Sequence in context: A110445 A305608 A128387 * A193664 A080875 A001543

Adjacent sequences: A061516 A061517 A061518 * A061520 A061521 A061522

KEYWORD

base,nonn,changed

AUTHOR

Amarnath Murthy, May 08 2001

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), May 11 2001

STATUS

approved