Monthly archive for April2008

Day 80

80 is the smallest number that is diminished by taking its sum of letters (writing out its English name and adding the letters using a=1, b=2, c=3, …) – EIGHTY = 5+9+7+8+20+25 = 74. It seems like so long ago that I wrote anything on…

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Day 74

74 is the twenty first distinct biprime, and the eleventh of the form (2.q) In some ways I wish I wasn’t writing a blog entry for today, but unfortunately I am. What happens when you go out to the crag without climbing shoes on purpose…

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Day 73

73 is the largest two-digit Unholey prime: such primes do not have holes in their digits. Success always comes at a price. In fact, everything has it’s price and it’s always worth remembering that. It’s not always obvious what price you pay for the choices…

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Day 71

71 is the only two-digit number n such that (nn-n!)/n is prime. The last two days have seen bad weather, but among the rain and clouds I found something I’d been missing all week. To train you have to be motivated, and to be motivated…

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Day 68

68 is a happy number. How nice! I was feeling on a high after the weekend, but also very, very sore. My shoulders were aching through till Tuesday, and then my lats picked up where the shoulders left on on Wednesday. I’ve also had a…

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Day 62 and 63

Day 62 and 63 62 is the only number whose cube (238328) consists of 3 digits each occurring 2 times, whilst 63 is a Woodall number and a Harshad number. Something a little different in this entry, as I eschewed the forest and drove like…

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Day 58

58 is the maximal number of regions into which a plane can be divided by 8 circles. Two days of climbing in a row! Oh what a joy! I have to confess that I was carrying a split tip into todays session due to vanity…

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Day 57

59 is the 17th smallest prime number. The next is sixty-one, with which it comprises a twin prime. 59 is an irregular prime, a safe prime and the 14th supersingular prime. It is an Eisenstein prime as well as a Pillai prime. The last few…

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Day 54

54 can be written as the sum of three squares in three different ways: 72 + 22 + 12 = 62 + 2(32) = 2(52) + 22 = 54. It is the smallest number with this property. I’m beginning to become reticent about writing these…

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