OFFSET
1,1
COMMENTS
Subsequence of A009003. - M. F. Hasler, Feb 06 2009
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
FORMULA
Numbers k such that A006530(k) == 1 (mod 4).
MAPLE
filter:= proc(n)
max(numtheory:-factorset(n)) mod 4 = 1
end proc:
select(filter, [$1..200]); # Robert Israel, Sep 11 2020
MATHEMATICA
Select[Range[2, 150], Mod[FactorInteger[#][[-1, 1]], 4] == 1 &] (* Amiram Eldar, May 04 2022 *)
PROG
(PARI) for(n=2, 200, if((component(component(factor(n), 1), omega(n))-1)%4==0, print1(n, ", ")))
(PARI) for( n=2, 99, vecmax(factor(n)[, 1])%4==1 && print1(n", ")) \\ M. F. Hasler, Feb 06 2009
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Jun 07 2002
STATUS
approved