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A118532 Start with 1 and repeatedly reverse the digits and add 15 to get the next term. 3
1, 16, 76, 82, 43, 49, 109, 916, 634, 451, 169, 976, 694, 511, 130, 46, 79, 112, 226, 637, 751, 172, 286, 697, 811, 133, 346, 658, 871, 193, 406, 619, 931, 154, 466, 679, 991, 214, 427, 739, 952, 274, 487, 799, 1012, 2116, 6127, 7231, 1342, 2446 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
This sequence never cycles.
The plot (see the Noe link) shows 2774 terms of this sequence. It has a regular structure, which continues at higher decades. - T. D. Noe, May 10 2006
LINKS
T. D. Noe, Plot of A118532
N. J. A. Sloane and others, Sequences of RADD type, OEIS wiki.
FORMULA
This sequence never cycles. After a while, the pattern of length changes settles into an increasing pattern: 10^(4m)+3, 10^(4m+1)+3, 10^(4m+2)+12, 10^(4m+3)+12, 10^(4(m+1))+3, ... The key is that every two steps adds 15 at each end, unless there is a carry across the middle or a trailing 0. This allows many steps to be carried out in a single operation. - Martin Fuller, May 12 2006
a(n+1) = A004086(a(n)) + 15. - Reinhard Zumkeller, Jan 29 2014
PROG
(PARI) A118532(Nmax, Q=15, S=1)=vector(Nmax, i, if(i>1, S=A004086(S)+Q, S)) \\ - M. F. Hasler, May 06 2012
(Haskell)
a118532 n = a118532_list !! (n-1)
a118532_list = iterate ((+ 15) . a004086) 1
-- Reinhard Zumkeller, Jan 29 2014
CROSSREFS
Sequence in context: A189949 A103111 A118862 * A253691 A300919 A007834
KEYWORD
nonn,base,look
AUTHOR
N. J. A. Sloane, May 06 2006
STATUS
approved

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Last modified February 21 07:54 EST 2024. Contains 370219 sequences. (Running on oeis4.)