Find the next number in the following series:
123, 354, 897, 1875, 10626, ?
Answer: Many thanks to all our readers who had a go at this one – not everyone got to the correct answer, 16887. Extra well done, so, in order of reply to: John Droogan, advanced polymers and composites, MegaChem (UK) Ltd, Caldicot, Monmouthshire, UK; Hans-Bernd Lüchtefeld, market research & communication manager, PHP Fibers GmbH, Obernburg, Germany; Bharat B Sharma, Sr VP product development & technical service (elastomers), Reliance Industries Ltd, Gujarat, India; Ramasubramanian P, manager, marketing – mixer and LTKMPL products, rubber processing machinery, Larsen & Toubro Ltd, Vedal Village, Kanchipuram, Tamil Nadu, India; Michele Girardi, Scame Mastaf Spa, Suisio, Italy; John Bowen, consultant, Bromsgrove, UK: Andrew Beasley, product analyst, Hankook Tyre UK Ltd, UK; Michael Easton, sales and marketing director, Globus Group, Manchester, UK; Amparo Botella, Ismael Quesada SA, Spain; Yuichi (Joe) Sano, Sumitomo Electric Industries Ltd, Itami, Japan.
Lots of neat workings out, but here’s John Droogan’s reply – within minutes of the Monday send-out – to show how it’s done:
123 > 231 then add 123 gives 354
354 > 543 then add 345 gives 897
897 > 978 then add 897 gives 1875
1875 >8751 then add 1875 gives 10626
10626 > 06261 then add 10626 gives 16887.