OFFSET
1,1
COMMENTS
Contains 2^p-1 for p in A107360 except 3.
Contains all terms of A325255 except 2 and 4.
Contains k-1 for k in A027856 except 4.
Contains k-2 for k in A327240 except 6 and 8. - Ray Chandler, Sep 14 2019
LINKS
Ray Chandler, Table of n, a(n) for n = 1..178 (terms < 10^1000; first 114 terms from Robert Israel)
Ray Chandler, Mathematica code used to compute b-file.
Math StackExchange, Three consecutive numbers with exactly different four prime factors.
EXAMPLE
a(3)=10 is in the sequence because 10*11*12 has four distinct prime factors: 2, 3, 5, 11.
MAPLE
select(t -> nops(numtheory:-factorset(t) union numtheory:-factorset(t+1) union numtheory:-factorset(t+2))=4, [$1..10^6]);
PROG
(PARI) select(k->4==omega(k*(k+1)*(k+2)), [1..10000]) \\ Andrew Howroyd, Sep 05 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
J. M. Bergot and Robert Israel, Sep 05 2019
STATUS
approved