|
|
A177884
|
|
Pseudoprimes to base 2 of the form 4k+3.
|
|
3
|
|
|
1387, 2047, 4371, 8911, 13747, 14491, 19951, 42799, 60787, 90751, 123251, 150851, 256999, 258511, 271951, 272251, 275887, 294271, 387731, 396271, 422659, 435671, 443719, 452051, 476971, 514447, 672487, 680627, 741751, 769567, 877099, 916327, 1024651, 1052503, 1092547, 1152271, 1277179, 1302451, 1325843, 1397419, 1419607, 1433407, 1441091, 1459927
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
In at least the first 1801533 values (that is, for 2-pseudoprimes <10^15) of A001567, the entries of the form 4k+3 are less numerous than those of the form 4k+1. Is this always the case?
|
|
LINKS
|
|
|
FORMULA
|
|
|
PROG
|
(PARI) forstep(n=3, 10^7, 4, if(isprime(n), next()); if(Mod(2, n)^(n-1)==1, print1(n, ", ")))
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|