login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A127320 Start with i=1 and j=2. Concatenate i and j, get k = floor ij/j, concatenate j and k, etc. 0
1, 2, 6, 4, 16, 26, 62, 42, 148, 284, 522, 545, 958, 569, 1684, 3379, 4984, 6780, 7352, 9222, 7973, 11567, 68929, 16782, 410732, 40859, 1005243, 406459, 2473172, 1643473, 15048450, 10921212, 137791026, 79259241, 173848531 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It is easy to see that in all such sequences a(n+2) > a(n). Therefore for any pair of initial terms, the sequence consist of two interweaving strictly increasing subsequences formed by the elements at odd and even positions. So there are no loops in such sequences.

LINKS

Table of n, a(n) for n=1..35.

PROG

(PARI) a=[1, 2]; for(k=3, 50, a=concat(a, [eval(concat(Str(a[k-2]), Str(a[k-1])))\a[k-1]])); a

CROSSREFS

Sequence in context: A095754 A226718 A181159 * A098917 A054786 A269372

Adjacent sequences:  A127317 A127318 A127319 * A127321 A127322 A127323

KEYWORD

nonn,base

AUTHOR

Eric Angelini, Aug 05 2007

EXTENSIONS

More terms, PARI program and comment from Max Alekseyev, Aug 05 2007

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 26 09:37 EDT 2020. Contains 334620 sequences. (Running on oeis4.)