A025490 - OEIS

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A025490

Numbers k such that the sum of the digits of Fibonacci(k) in base 11 is k.

0, 1, 5, 13, 41, 53, 55, 60, 61, 90, 97, 169, 185, 193, 215, 265, 269, 353, 355, 385, 397, 437, 481, 493, 617, 629, 630, 653, 713, 750, 769, 780, 889, 905, 960, 1013, 1025, 1045, 1205, 1320, 1405, 1435, 1501, 1620, 1650, 1657, 1705, 1735, 1769, 1793, 1913, 1981

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

OFFSET

1,3

COMMENTS

In his article, Terr estimated the number of terms to be 684 +- 26, which agrees with the found count of 710. - Sven Simon, Aug 06 2006

LINKS

Sven Simon, Table of n, a(n) for n = 1..711 [May be complete]

David Terr, On the Sums of Digits of Fibonacci Numbers, Fibonacci Quarterly 34, Aug. 1996, pp. 349-355.

PROG

(PARI) isok(n) = sumdigits(fibonacci(n), 11) == n; \\ Michel Marcus, Jun 08 2019

(Magma) [k:k in [0..2000]| &+Intseq(Fibonacci(k), 11) eq k]; // Marius A. Burtea, Jun 09 2019

CROSSREFS

Cf. A020995 (base 10), A020996 (base 12).

Cf. A025491 (with Lucas numbers).

Sequence in context: A337336 A121872 A228922 * A216824 A230812 A087938

Adjacent sequences: A025487 A025488 A025489 * A025491 A025492 A025493

KEYWORD

base,nonn,changed

AUTHOR

David W. Wilson

EXTENSIONS

Title clarified and offset changed to 1 by Sean A. Irvine, May 06 2019

STATUS

approved