Roger Schofield, Author at New �Ӱ�ԭ��

Enigma Number 1643

Roger Schofield — Wed, 20 Apr 2011 17:00:00 +0000

Divisibility test

abcdefghij is a 10-digit number containing one each of the digits 0 to 9 in some order (a ≠ 0). With the exception of the letter which represents zero, a divides abcdefghij, b divides bcdefghij, c divides cdefghij and so on to the end.

What are the largest and smallest 10-digit numbers with this property?

WIN £15 will be awarded to the sender of the first correct answer opened on Tuesday 24 May. The Editor’s decision is final. Please send entries to Enigma 1643, New �Ӱ�ԭ��, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).

Answer to 1637 In-laws: Alan and Geraldine Tall, Brian and Hannah Long, Colin and Eleanor Short, David and Fiona Long

The winner Richard Crews of San Jose, California, US

Enigma 876 : Short circuit

Roger Schofield — Fri, 24 May 1996 23:00:00 +0000

WE SPENT our holiday on the oddly-shaped island of Hexonia. One day, we drove
around the coast road which was in the form of a hexagon with each angle
120°. I remember noticing that each straight was a different perfect square
whole number of kilometres and that the complete circuit was less than 500
kilometres.

How far did we drive?

A £10 book token will be awarded to the sender of the first correct
answer opened on Thursday 27 June. The Editor’s decision is final. Please send
entries to Enigma 876, New �Ӱ�ԭ��, King’s Reach Tower, Stamford Street,
London SE99 0BB. The winner of Enigma 870 was Jane Farey of Newbury, Berks.

Answer to Enigma 870

Cabinet reshuffle

Laura moved to the Home Office, Ken Etcher is the new Defence Secretary, and
the old Defence Secretary moved to Agriculture.