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A275419 Representable integers n that are not the inverse of their inverse in binary64 (double precision) IEEE 754 floating-point arithmetic (Version where n and 1/(1/n) are unequal). 2
49, 93, 98, 99, 103, 105, 107, 117, 123, 186, 196, 197, 198, 206, 210, 211, 214, 221, 227, 234, 237, 239, 243, 245, 246, 249, 253, 372, 391, 392, 393, 394, 396, 412, 415, 417, 420, 422, 425, 428, 442, 443, 445, 454, 459, 468, 474, 478, 479, 483, 486, 489, 490, 491, 492, 497, 498, 499, 501 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Note that n*(1/n) and 1 are unequal for a different integer sequence.

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

PROG

(C) int is(int n) {

  double d = n;

  double di = 1/d;

  return 1/di != d;

} /* Charles R Greathouse IV, Jul 29 2016 */

CROSSREFS

Sequence in context: A224905 A224846 A260469 * A031180 A039427 A043250

Adjacent sequences:  A275416 A275417 A275418 * A275420 A275421 A275422

KEYWORD

nonn,base,fini,less

AUTHOR

Julien Freslon, Jul 27 2016

STATUS

approved

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Last modified February 20 08:05 EST 2020. Contains 332069 sequences. (Running on oeis4.)