OFFSET
1,1
EXAMPLE
21871365 is in the sequence as it starts a run of at least 4 consecutive numbers each with exactly 5 distinct prime factors.
That is each of 21871365 = 3 * 5 * 29 * 137 * 367, 21871365 + 1 = 21871366 = 2 * 11 * 37 * 97 * 277, 21871365 + 2 = 21871367 = 7*17*23*61*131, 21871365 + 3 = 21871368 = 2^3 * 3^2 * 31 * 41 * 239 have 5 distinct prime factors.
PROG
(PARI) upto(n) = {my(res = List(), streak = 0); n+=3; forfactored(i = 1, n, if(omega(i[2]) == 5, streak++; if(streak >= 4, listput(res, i[1]-3)), streak = 0)); res}
CROSSREFS
KEYWORD
nonn
AUTHOR
David A. Corneth, Jul 24 2023
STATUS
approved