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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A074931 Primes p such that 3p is equidistant from consecutive prime twin pairs.

Original entry on oeis.org

3, 5, 17, 29, 41, 71, 149, 281, 317, 347, 359, 397, 647, 751, 787, 857, 907, 1093, 1279, 1381, 1511, 1531, 1663, 1783, 2447, 2683, 2803, 3271, 3323, 4019, 4153, 4513, 4567, 4639, 5557, 5647, 5801, 5923, 6599, 6659, 6911, 7013, 7573, 7883, 9187, 9257, 9431
Offset: 1

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Author

N. Fernandez (primeness(AT)borve.org), Zak Seidov, Oct 10 2002

Keywords

Comments

Numbers equidistant from consecutive twins (see A074953) are multiples of 3 and they may be almost primes only of form 3*prime. In the sequence, these primes are given. Also: A001748 (3*prime 2-almost-primes) and A001358 (all 2-almost-primes).

Examples

			17 is in the sequence because 3 * 17 = 51 is equidistant between {41, 43} and {59, 61}.
19 is not in the sequence because 3 * 19 = 57, which is much closer to {59, 61} than to {41, 43}.

Crossrefs

Cf. A001358, A001748, A074953.

Extensions

New name from Charles R Greathouse IV, Oct 12 2013
Previous Showing 41-41 of 41 results.

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