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

Author

M. F. Hasler, Jan 07 2012

Keywords

• nonn
• base

Comments

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

Examples

			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.
		

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

Programs

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)))

Extensions

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