A274172 Nonsquare composites with all prime factors larger than 5.

77, 91, 119, 133, 143, 161, 187, 203, 209, 217, 221, 247, 253, 259, 287, 299, 301, 319, 323, 329, 341, 343, 371, 377, 391, 403, 407, 413, 427, 437, 451, 469, 473, 481, 493, 497, 511, 517, 527, 533, 539, 551, 553, 559, 581, 583, 589

Offset

1,1

Comments

Nonsquare composites not divisible by 2,3,5.

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Example

377 = 13*29 is a term.

Maple

filter:= n -> igcd(n, 30)=1 and not issqr(n) and not isprime(n):
select(filter, [seq(i, i=3..1000, 2)]); # Robert Israel, May 30 2021

Prog

(PARI) { for(n=1, 600, if(!(isprime(n) || n%2==0 || n%3==0 || n%5==0 || issquare(n)), print1(n", ")))}
(PARI) is(n) = my(f=factor(n)); if(!issquare(n), f[1, 1]>5 && matsize(f)[1]>1, 0) \\ David A. Corneth, Jun 12 2016

Crossrefs

Intersection of A007775 and A089229. - Felix Fröhlich, Jun 12 2016

Sequence in context: A294741 A052202 A089525 * A061671 A269809 A064902

Adjacent sequences: A274169 A274170 A274171 * A274173 A274174 A274175

Keyword

nonn

Author

Dimitris Valianatos, Jun 12 2016

Status

approved