The On-Line Encyclopedia of Integer Sequences (OEIS)

Revisions by Eric M. Schmidt (See also Eric M. Schmidt's wiki page)

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A262222

Decimal representations of hexadecimal numbers that can be misinterpreted as decimal numbers in scientific E notation.
(history; published version)

#46 by Eric M. Schmidt at Thu Sep 28 23:35:34 EDT 2023

STATUS

editing

proposed

Discussion

Fri Sep 29

02:02

Joerg Arndt: using #define instead of constexpr in C++ is a crime!

10:12

Joerg Arndt: oh, I see, it is C not C++

#45 by Eric M. Schmidt at Thu Sep 28 23:32:52 EDT 2023

COMMENTS

Numbers whose hexadecimal representation matches the regular expression [1-9][0-9]*e[0-9]+. - Eric M. Schmidt, Sep 28 2023

PROG

(C)

#include <stdbool.h>

#define DIGIT_E 14

bool isA262222(int k)

{

if (k <= 0 || k % 16 == DIGIT_E) return false;

bool foundE = false;

int digit;

while (k > 0) {

digit = k % 16;

if (digit == DIGIT_E) {

if (foundE) return false;

foundE = true;

}

else if (digit > 9) return false;

k /= 16;

}

return foundE && digit != DIGIT_E;

} // Eric M. Schmidt, Sep 28 2023

STATUS

approved

editing

A023000

a(n) = (7^n - 1)/6.
(history; published version)

#80 by Eric M. Schmidt at Sun Sep 11 23:46:32 EDT 2022

STATUS

editing

proposed

#79 by Eric M. Schmidt at Sun Sep 11 23:44:13 EDT 2022

LINKS

Wikipedia, <a href="https://en.wikipedia.org/wiki/As_I_was_going_to_St_Ives">As I was going to St Ives</a>.

STATUS

approved

editing

A347373

Number of Aut(G)-orbits on G-characters that come from Riemann surfaces of genus n.
(history; published version)

#6 by Eric M. Schmidt at Sat Sep 04 04:08:17 EDT 2021

STATUS

editing

proposed

A347372

Number of signature-group pairs for Riemann surfaces of genus n.
(history; published version)

#6 by Eric M. Schmidt at Sat Sep 04 04:08:08 EDT 2021

STATUS

editing

proposed

A347369

Number of signatures of Fuchsian groups of orbit genus 0 leading to automorphism groups of Riemann surfaces of genus n.
(history; published version)

#6 by Eric M. Schmidt at Sat Sep 04 04:08:02 EDT 2021

STATUS

editing

proposed

A347368

Number of signatures of Fuchsian groups leading to automorphism groups of Riemann surfaces of genus n.
(history; published version)

#7 by Eric M. Schmidt at Sat Sep 04 04:07:57 EDT 2021

STATUS

editing

proposed

A347373

Number of Aut(G)-orbits on G-characters that come from Riemann surfaces of genus n.
(history; published version)

#5 by Eric M. Schmidt at Sat Sep 04 04:07:51 EDT 2021

LINKS

Thomas Breuer, <a href="http://www.math.rwth-aachen.de/~Thomas.Breuer/genus/doc/errata.pdf">Errata et addenda Addenda for Characters and automorphism groups Automorphism Groups of Compact Riemann surfacesSurfaces</a>.

STATUS

proposed

editing

A347372

Number of signature-group pairs for Riemann surfaces of genus n.
(history; published version)

#5 by Eric M. Schmidt at Sat Sep 04 04:07:33 EDT 2021

LINKS

STATUS

proposed

editing