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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A078830 Numbers having in binary representation exactly one binary substring representing a prime.

Original entry on oeis.org

2, 3, 4, 8, 9, 16, 32, 33, 64, 65, 128, 129, 256, 512, 513, 1024, 1025, 2048, 2049, 4096, 4097, 8192, 8193, 16384, 16385, 32768, 32769, 65536, 131072, 131073, 262144, 262145, 524288, 524289, 1048576, 1048577, 2097152, 2097153, 4194304, 4194305
Offset: 1

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Author

Reinhard Zumkeller, Dec 08 2002

Keywords

Comments

A078827(a(n)) = 1; subsequence of A078829 and of A078831;
for k>2 also floor(a(k)/2) belongs to the sequence.

Examples

			p=2 -> '10' is the only prime contained exactly once in 2^k, k>0.

Crossrefs

Cf. A078827, A078829, A007088, A000079, A048578.

Extensions

Extended by Ray Chandler, Nov 03 2008
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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