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Search: id:A114139
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| A114139 |
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Changes in United States postal rates per ounce since 1863. |
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+0
1
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| -2, -2, 1, -1, 1, 1, 1, 1, 2, 2, 0, 3, 2, 3, 2, 2, 3, 4, 3, 3, 1, 1, 3, 2
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Benjamin Franklin, first Postmaster General of the United States, applied computational complexity theory to Economics by changing the business plan for American mail by changing from payment by distance to payment by weight. "Before stamps were used a person had to collect his mail at the post office and pay for it. Franklin stopped the money loss on unclaimed mail in Philadelphia by printing in his paper the names of persons who had mail awaiting them. He also developed a simple, accurate way of keeping post-office accounts. In 1753 Franklin was made deputy postmaster general for all the colonies." [Encyclopedia Brittanica]
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REFERENCES
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R. Alter and J. A. Barnett, A postage stamp problem, Amer. Math. Monthly, 87 (1980), 206-210.
R. K. Guy, Unsolved Problems in Number Theory, C12.
W. F. Lunnon, A postage stamp problem. Comput. J. 12 (1969) 377-380.
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LINKS
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Author?, U.S. Postal Service Commemorates Benjamin Franklin's 300th Birthday.
A. K. Dart, Postage rates USA
1847usa.com, United States Postage Stamps By Year.
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FORMULA
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a(n) = first differences of A114062.
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EXAMPLE
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a(1) = -2 because the rate per half ounce was lowered effective 3 March 1863 from 3 cents to 2 cents; thereafter rates were per ounce.
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CROSSREFS
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Cf. A114062, A001212, A001213, A014616, A001208, A001209, A001210, A001211, A001212, A001213, A001214, A001215, A001216, A005342, A005343, A005344, A014616, A053346, A053348, A075060, A084192, A084193.
Adjacent sequences: A114136 A114137 A114138 this_sequence A114140 A114141 A114142
Sequence in context: A102681 A025453 A094215 this_sequence A029884 A118164 A099563
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KEYWORD
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easy,fini,sign
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AUTHOR
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Jonathan Vos Post (jvospost2(AT)yahoo.com), Feb 03 2006
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