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.

Showing 1-2 of 2 results.

A166731 Positive integers with English names ending in "d".

Original entry on oeis.org

100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900, 4000, 4100, 4200, 4300, 4400
Offset: 1

Views

Author

Rick L. Shepherd, Oct 20 2009

Keywords

Comments

To avoid ambiguity, the American system is used here; i.e., no names such as "milliard" or "billiard".
Different from multiples of 100 (see example) and from A044332 (10100 is a term of the present sequence). In fact, if all names of multiples of a million are considered to end with an "n" (even beyond the usual naming system: see A146755 for links), those numbers are terms of A060228, not this sequence, meaning this sequence is precisely {positive multiples of 100} MINUS {(positive) multiples of 1000000}.

Examples

			One hundred (100) is a term; one million (1000000) is not a term (but is a term of A060228).

Crossrefs

Cf. A166726, A166727, A166728, A166729, A166730, A059093, A060228.

A166713 Alliterative-digit numbers: Positive integers n such that the English names of the decimal digits of n begin with the same letter; ignore single-digit numbers.

Original entry on oeis.org

11, 22, 23, 32, 33, 44, 45, 54, 55, 66, 67, 76, 77, 88, 99, 111, 222, 223, 232, 233, 322, 323, 332, 333, 444, 445, 454, 455, 544, 545, 554, 555, 666, 667, 676, 677, 766, 767, 776, 777, 888, 999, 1111, 2222, 2223, 2232, 2233, 2322, 2323, 2332, 2333, 3222, 3223
Offset: 1

Views

Author

Rick L. Shepherd, Oct 19 2009

Keywords

Comments

The multi-digit repdigits (A014181) are a subsequence. No term contains the digit 0 (zero). All terms containing digits 1 (one), 8 (eight), or 9 (nine) are also terms of A014181. Any term not mentioned above is a string of 2's (twos) and 3's (threes) only (a multi-digit term of A032810), 4's (fours) and 5's (fives) only, or 6's (sixes) and 7's (sevens) only.

Examples

			454 is a term as digits "four", "five", "four" each begin with the letter "f".

Crossrefs

Cf. A146755, A014181, A032810.
Showing 1-2 of 2 results.

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