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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A268694 Terms of A268693 that are not divisible by 255.

Original entry on oeis.org

1, 3, 5, 7, 144465, 4330455
Offset: 1

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Author

Arkadiusz Wesolowski, Feb 11 2016

Keywords

Comments

The conjecture in A156695 implies that each term greater than 1 can be written in the form p + 2^x, where p is a prime. For example: 144465 - 2^2 = 144461 (a prime), 4330455 - 2^8 = 4330199 (a prime).

Crossrefs

Cf. A156695, A268693.

A268695 Odd numbers n that are neither of the form p + 2^a + 2^b nor of the form p - 2^a - 2^b with 2^a + 2^b < n, b > a > 0, and p prime.

Original entry on oeis.org

1, 3, 5, 255, 65535, 196605, 327675, 5177265, 29687355, 32046615, 81328935, 109246845, 121436355, 129955905, 139392945, 193000575, 194704485, 228258405, 252375285, 363260505, 371911125, 404678625, 435611145, 491446965, 523821255, 528670845, 535879695, 560914065
Offset: 1

Views

Author

Arkadiusz Wesolowski, Feb 11 2016

Keywords

Crossrefs

Subsequence of A268693.
Showing 1-2 of 2 results.

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