1,3

Loomis has verified that all n up to 1000000 eventually join the trajectory of A063108.

Paul Tek, Table of n, a(n) for n = 1..10000

P. A. Loomis, An Interesting Family of Iterated Sequences.

P. A. Loomis, An Introduction to Digit Product Sequences, J. Rec. Math., 32 (2003-2004), 147-151.

P. A. Loomis, An Introduction to Digit Product Sequences, J. Rec. Math., 32 (2003-2004), 147-151. [Annotated archived copy]

Paul Tek, C program for this sequence

Index entries for Colombian or self numbers and related sequences

a(3)=5 because the trajectory for 1 (Sequence A063108) starts

1->2->4->8->16->22->26->38->62->74...

and the sequence for 3 starts

3->6->12->14->18->26->38->62->74...

so the sequence beginning with 3 joins A063108 after 5 steps.

(C) See Link section.

Sequence in context: A159751 A190914 A153458 * A240243 A144483 A098403

Adjacent sequences: A096284 A096285 A096286 * A096288 A096289 A096290

base,nonn

Jason Earls, Jun 23 2004

approved