[seqfan] Re: Add (to me) my even biggest digit

Juan Arias de Reyna arias at us.es
Sun Oct 12 21:34:34 CEST 2014


In this case it stops at 700

2, 4, 8, 16, 22, 24, 28, 36, 42, 46, 52, 54, 58, 66, 72, 74, 78, 86, 94, 98, 
106, 112, 114, 118, 126, 132, 134, 138, 146, 152, 154, 158, 166, 172, 174, 
178, 186, 194, 198, 206, 212, 214, 218, 226, 232, 234, 238, 246, 252, 254, 
258, 266, 272, 274, 278, 286, 294, 298, 306, 312, 314, 318, 326, 332, 334, 
338, 346, 352, 354, 358, 366, 372, 374, 378, 386, 394, 398, 406, 412, 416, 
422, 426, 432, 436, 442, 446, 452, 456, 462, 468, 476, 482, 490, 494, 498, 
506, 512, 514, 518, 526, 532, 534, 538, 546, 552, 554, 558, 566, 572, 574, 
578, 586, 594, 598, 606, 612, 618, 626, 632, 638, 646, 652, 658, 666, 672, 
678, 686, 694, 700, 700 


On 12/10/2014, at 21:03, Eric Angelini <Eric.Angelini at kntv.be> wrote:

> Hello SeqFans,
> I'm playing around with integers to 
> which one would add their biggest
> even digit.
> 
> The rule:
>> To get a(n+1), add to a(n) its biggest 
> even digit. Iterate.
> 
> Is there an infinite such sequence?
> If yes, it might start with a(1)=2:
> 
> E=2,4,8,16,22,24,28,36,42,46,52,54,
> 58,66,72,74,78,86,94,98,106,...
> 
> But I'm not sure E won't stop at some 
> point.
> 
> This is because the sequence starting 
> for instance with a(1)=804 indeed 
> stops:
> 
> 804,812,820,... ,884,892, 900 END.
> 
> Best,
> É.
> 
> _______________________________________________
> 
> Seqfan Mailing list - http://list.seqfan.eu/




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