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.

A181706 Numbers of the form 2^(t-1)*(2^t-17), where 2^t-17 is prime.

Original entry on oeis.org

1504, 30592, 8353792, 2146926592, 34357510144, 549746900992, 8796057370624, 140737345748992, 9223372000347553792, 2361183240850707054592, 9671406556879650002305024, 154742504910523000781012992
Offset: 1

Views

Author

Vladimir Shevelev, Nov 06 2010

Keywords

Comments

All entries are near-perfect numbers (A181595). The proof follows as in A181705, but this time the abundance is 16.

Crossrefs

Cf. A059611, A181595, A181701, A000396, A181703, A181704, A181705.

A181707 Numbers of the form m=2^(t-1)*(2^t-33), where 2^t-33 is prime.

Original entry on oeis.org

992, 28544, 122624, 507392, 34355412992, 8796023816192, 140737211531264, 144115179217485824, 9671406556844465630216192, 162259276829213066154002603835392, 11417981541647679048463794346093005918389141504
Offset: 1

Views

Author

Vladimir Shevelev, Nov 06 2010

Keywords

Comments

Generated by t= 6, 8, 9, 10, 18, 22, 24, 29, 42, 54, 77, 90, 102, 137,...
A subsequence of A181595 because the abundance of m is 32, and 32 divides 2^(t-1) and therefore divides m.

Crossrefs

Cf. A181595, A181701, A000396, A181703, A181704, A181705, A181706, A175989.

Extensions

Definition simplified and more terms added by R. J. Mathar, Nov 18 2010
Showing 1-2 of 2 results.

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