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A203924 Indices of terms which appear at least twice already earlier in A061205. 2
372, 441, 483, 492, 651, 672, 861, 2412, 2532, 2652, 3162, 3472, 3612, 3720, 3732, 3782, 3852, 3913, 3972, 4053, 4182, 4221, 4263, 4410, 4431, 4473, 4592, 4623, 4641, 4683, 4704, 4812, 4824, 4830, 4851, 4853, 4893, 4920, 4932, 4944, 6132, 6174, 6231, 6293 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Motivated by a question from  Franklin T. Adams-Watters, cf. link.

LINKS

M. F. Hasler, Table of n, a(n) for n = 1..101

Franklin T. Adams-Watters, Number times reversal, SeqFan list, Jan 07 2012

Hans Havermann, Augmented table of n, a(n) (in bold) and its associated indices, for n = 1..21313

EXAMPLE

A061205(156)=101556=A061205(273)=A061205(372), and this is the first time a term appears for the third time in A061205, therefore a(1)=372.

PROG

(PARI) seen=dupe=[]; for(n=0, 999999, setsearch(seen, t=A061205(n)) | !(seen=setunion(seen, Set(t))) | next; setsearch(dupe, t) & (print1(n", ")|next); dupe=setunion(dupe, Set(t)))

CROSSREFS

Sequence in context: A051182 A281860 A161362 * A004021 A240249 A200885

Adjacent sequences:  A203921 A203922 A203923 * A203925 A203926 A203927

KEYWORD

nonn,base

AUTHOR

M. F. Hasler, Jan 07 2012

EXTENSIONS

a(8)-a(44) from Donovan Johnson, Jan 07 2012

STATUS

approved

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Last modified July 23 05:58 EDT 2017. Contains 289686 sequences.