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

Author

Dimitris Valianatos, Jun 12 2016

Keywords

• nonn

Comments

Nonsquare composites not divisible by 2,3,5.

Examples

			377 = 13*29 is a term.
		

Links

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

Crossrefs

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

Programs

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

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