OFFSET
1,1
COMMENTS
Subset of A045940, Numbers m such that the factorizations of m..m+3 have the same number of primes (including multiplicities).
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..10000
EXAMPLE
211673 = 7*11*2749, 211674 = 2*3*35279, 211675 = 5^2*8467, 211676 = 2^2*52919, 211677 = 3*37*1907, 211678 = 2*109*971, 211679 = 13*19*857 are all triprimes.
355923 = 3^2*71*557, 355924 = 2^2*101*881, 355925 = 5^2*23*619, 355926 = 2*3*137*433, 355927 = 11*13*19*131, 355928 = 2^3*44491, 355929 = 3*7*17*997 are all products of 4 primes (typo corrected Zak Seidov, Oct 24 2022).
PROG
(PARI) c=0; p1=0; for(n=2, 10^8, p2=bigomega(n); if(p1==p2, c++; if(c>=6, print1(n-6 ", ")), c=0; p1=p2)) /* Donovan Johnson, Mar 20 2013 */
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Nov 05 2006
EXTENSIONS
a(14)-a(27) from Donovan Johnson, Mar 26 2010
STATUS
approved