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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A108880 Alphabetically earliest number that is a product of exactly n primes.

Original entry on oeis.org

8018018851, 8000000018, 8, 8018000018, 8018018886, 8018018085, 8018018808, 8000000008, 8018018000, 8018018048, 8018018816, 8018018176, 8018808000, 8018808832, 8018000000, 8018018304, 8018887680, 8018804736, 8018853888
Offset: 1

Views

Author

Jonathan Vos Post, Jul 14 2005

Keywords

Comments

Conway and Guy note that 8018018851 is, alphabetically, the first prime number in the American system of large number terminology and term this "Knuth's number." We have "eight billion" alphabetically before "eighteen" or "eighty."

Examples

			n Alphabetically first n-almost prime
1 8018018851
2 8000000018 = 2 * 4000000009
3 8 = 2^3
4 8018000018 = 2 * 7 * 97 * 5904271
5 8018018886 = 2 * 3 * 19 * 6661 * 10559
6 8018018085 = 3 * 5 * 7 * 11 * 163 * 42589
7 8018018808 = 2^3 * 3 * 31 * 2161 * 4987
8 8000000008 = 2^3 * 7 * 11 * 13 * 19 * 52579
9 8018018000 = 2^4 * 5^3 * 127 * 31567
10 8018018048 = 2^8 * 43 * 728381

References

  • Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, p. 15, 1996.

Links

Crossrefs

Cf. A000052.

Extensions

Corrected and extended by Ray Chandler, Jul 25 2005
Definition clarified by N. J. A. Sloane, Sep 27 2011

A109596 The first 12 numbers in alphabetical order: Eight, Eleven, Five, Four, Nine, One, Seven, Six, Ten, Three, Twelve, Two.

Original entry on oeis.org

8, 11, 5, 4, 9, 1, 7, 6, 10, 3, 12, 2
Offset: 1

Views

Author

Gerard de Ruiter (ghderuiter1234(AT)hotmail.com), Jul 29 2005

Keywords

Comments

The sequence will be different in other languages, for example in French: 5,2,10,12,8,9,11,4,7,6,3,1 (Cinq, Deux, Dix, Douze, Huit, Neuf, Onze, Quatre, Sept, Six, Trois, Un)

Crossrefs

A000052 is a better version.

Extensions

Corrected by Thomas Xkey, Oct 30 2006

A114343 Integer names in Hebrew in alphabetical order: 1-digit, then 2-digit, then 3-digit, etc.

Original entry on oeis.org

1, 0, 4, 5, 7, 3, 8, 6, 2, 9, 11, 40, 41, 44, 45, 47, 43, 48, 46, 42, 49, 14, 50, 51, 54, 55, 57, 53, 58, 56, 52, 59, 15, 10, 20, 21, 24, 25, 27, 23, 28, 26, 22, 29, 70, 71, 74, 75, 77, 73, 78, 76, 72, 79, 17, 30, 31, 34, 35, 37, 33, 38, 36, 32, 39, 13, 80, 81, 84, 85, 87, 83, 88
Offset: 1

Views

Author

Steven Steinsaltz (steinsaltz(AT)jhu.edu), Feb 08 2006

Keywords

Examples

			The numbers in Hebrew (beginning with 0) start with aleph-phey, aleph-het, shin-tav, shin-lamed, aleph-resh, het-mem, shin-shin, shin-vet, shin-mem, tav-shin and so the order is 1,0,4,5,7,3,8,6,2,9

Crossrefs

Cf. A000052, A001061, A001062, A097960.
Previous Showing 21-23 of 23 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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