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A080899 Primes p(k) such that every composite number between p(k) and p(k+1) has exactly three distinct prime factors. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 20 09:40 EDT 2021. Contains 348100 sequences. (Running on oeis4.)