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).

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

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