3 Jun
2020
3 Jun
'20
5:01 p.m.
Waow, well spotted Hans, thanks! à+ É. Catapulté de mon aPhone
Le 4 juin 2020 à 00:52, Hans Havermann <gladhobo@bell.net> a écrit :
EA: "109,87,65,43,21,1,23,45,67,89. Is this the longest chain where the mean of two adjacent terms is given by the concatenation of the two digits framing the comma between them?"
Apart from infinite chains starting with 11, 16, 22, 33, 44, 66, 77, 88, 99, & 106, I believe that it is. Note however that you may also replace the terminal 89 with 91. _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun