A080899 Primes p(k) such that every composite number between p(k) and p(k+1) has exactly three distinct prime factors.

29, 41, 59, 101, 137, 149, 179, 197, 227, 239, 269, 281, 311, 347, 521, 599, 617, 641, 643, 739, 809, 821, 827, 881, 1031, 1061, 1277, 1451, 1487, 1579, 1607, 1619, 1667, 1697, 1787, 1871, 1877, 1997, 2027, 2081, 2087, 2111, 2237, 2267, 2293, 2381

Offset

1,1

Links

Table of n, a(n) for n=1..46.

Prog

(PARI) forprime(p=3, 3000, f=0; for(k=p+1, nextprime(p+1)-1, if(omega(k)!=3, f=1; break)); if(!f, print1(p", ")))

Crossrefs

See A075583 for another version.

Sequence in context: A035789 A343478 A343479 * A216815 A157141 A107218

Adjacent sequences: A080896 A080897 A080898 * A080900 A080901 A080902

Keyword

nonn

Author

Ralf Stephan, Mar 30 2003

Status

approved