cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A220000 Sixty fourths of an inch in thousandths, rounded to nearest integer.

Original entry on oeis.org

16, 31, 47, 63, 78, 94, 109, 125, 141, 156, 172, 188, 203, 219, 234, 250, 266, 281, 297, 313, 328, 344, 359, 375, 391, 406, 422, 438, 453, 469, 484, 500, 516, 531, 547, 563, 578, 594, 609, 625, 641, 656, 672, 688, 703, 719, 734, 750, 766, 781
Offset: 1

Views

Author

Marc Alan Rosner, Dec 03 2012

Keywords

Comments

Diameter of successive drill bits, in thousandths of an inch, within an ordered set consisting of increments of 1/64th of an inch. Traditionally the sizes of bits in such a set are expressed in simplest reduced fractional inch values: 1/64, 1/32, 3/64, 1/16, etc. Of fundamental importance to machinists, tool and die makers, carpenters, hobbyists, insomnial science teachers, etc.

Examples

			For n = 5 the a(5) term = (5/64)*1000 = 78.125, which is rounded to 78.

References

  • Jack Erjavec, Automotive Technology, 2010, pages 66-73.
  • Frank D. Graham, Audels Machinists and Tool Makers Handy Book, 1941, pages 34-48.
  • IBM Corp., Precision Measurement in the Metal Working Industry, 1939, page 11.

Links

Crossrefs

Cf. A085269, A029919, A029920, A169860, A169861.

Programs

Formula

a(n) = round(125*n/8), with 0.5 rounded up.
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