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A215649 Reversals of tribonacci numbers (sorted). 1
0, 0, 1, 1, 2, 4, 7, 18, 31, 42, 44, 405, 472, 729, 941, 5071, 6313, 8675, 9853, 21066, 31591, 90601, 447014, 514121, 674557, 713322, 770074, 4606468, 7359831, 7575552, 8089735, 19520951, 52494292, 69005989, 106799181, 474396516, 777547433, 2586342311, 3016782802 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,5
COMMENTS
This is to A004170 as tribonacci numbers A000073 are to Fibonacci numbers A000045. Note that tribonacci(20) = 35890 is, upon reversal, 09853, then the leading 0 is truncated, making the 5-digit number into the 4-digit number 9853. Similarly, R(4700770) = 770074.
LINKS
EXAMPLE
A000073(n) for n = 7, 8, 9 = 13, 24, 44, 81. Reversed, those are 31, 42, 44, 18, and sorted that is 18, 31, 42, 44.
MATHEMATICA
Sort[FromDigits[Reverse[IntegerDigits[#]]]&/@LinearRecurrence[{1, 1, 1}, {0, 0, 1, 1}, 40]] (* Harvey P. Dale, Nov 22 2015 *)
CROSSREFS
Sequence in context: A047871 A290877 A103032 * A259351 A300913 A232484
KEYWORD
nonn,base,easy
AUTHOR
Jonathan Vos Post, Mar 09 2013
STATUS
approved

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Last modified February 22 02:30 EST 2024. Contains 370239 sequences. (Running on oeis4.)