Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Memorizing the Calendar II

Previously we learned how we can memorize the calendar [ For more on 'memorize the calendar' go here: http://www.braingle.com/mind/435.html ] for an entire year with just a 12-digit number. Here is a list of the secret numbers for various years.

2006=155274263153
2005=266315374264
2004=417426415375
2003=522641637527
2002=633752741631
2001=744163152742
2000=265274263153
1999=377426415375
1998=411537526416
1997=522641637527
1996=743752741631
1995=155274263153
1994=266315374264
1993=377426415375
1992=521537526416
1991=633752741631
1990=744163152742
1989=155274263153
1988=376315374264
1987=411537526416
1986=522641637527
1985=633752741631
1984=154163152742
1983=266315374264
1982=377426415375
1981=411537526416
1980=632641637527
1979=744163152742
1978=155274263153
1977=266315374264
1976=417426415375
1975=522641637527
1974=633752741631
1973=744163152742
1972=265274263153
1971=377426415375
1970=411537526416
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For more mind exercises: http://www.braingle.com/mind/