A203924 Indices of terms which appear at least twice already earlier in A061205.

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

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