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A087850 a(n)=a(a(a(a(a(n-1))))) + abs(2*a(n-1)-n). 0
1, 1, 2, 1, 4, 3, 2, 5, 2, 7, 4, 5, 4, 7, 2, 13, 10, 3, 14, 9, 4, 15, 8, 9, 8, 11, 6, 17, 6, 19, 8, 17, 2, 31, 28, 22, 8, 23, 8, 25, 10, 23, 4, 37, 30, 16, 16, 17, 16, 19, 14, 25, 4, 47, 40, 28, 3, 53, 48, 38, 19, 25, 14, 37, 10, 47, 28, 14, 42, 18, 36, 1, 72, 71, 69, 67, 64, 54, 33, 15 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A penta-recursive sequence.

This sequence blows up at n=176.

LINKS

Table of n, a(n) for n=1..80.

PROG

(TRUE BASIC) 60 REM BATRACHION SEQUENCE 70 DIM q0(0 to 4000) 80 LET q0(1)=1 90 LET q0(2)=1 91 FOR n = 3 to 176 92 LET q0(n)=q0(q0(q0(q0(q0(n-1)))))+Abs(2*q0(n-1)-n) 93 NEXT n 100 SET MODE "color" 110 SET WINDOW 0, 1024, 0, 750 301 PRINT" penta sequence" 302 PRINT" by Roger L. Bagula Oct 07 2003 " 381 OPEN #1: name "CM1:penta_data", create newold, org text 390 FOR x=1 to 176 391 PRINT #1: q0(x); ", "; 392 PRINT q0(x); 393 NEXT x 394 CLOSE #1 460 END

CROSSREFS

Sequence in context: A103122 A214918 A328394 * A087849 A075015 A205558

Adjacent sequences:  A087847 A087848 A087849 * A087851 A087852 A087853

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Oct 08 2003

STATUS

approved

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Last modified September 26 09:15 EDT 2021. Contains 347664 sequences. (Running on oeis4.)