login
A175091
Numbers k such that A074753(k) == (2,4) (mod 6).
0
4, 7, 13, 15, 21, 22, 23, 24, 40, 49, 50, 51, 52, 53, 54, 57, 64, 65, 66, 67, 68, 73, 74, 79, 80, 94, 95, 96, 99, 100, 101, 102, 111, 112, 122, 123, 124, 127, 134, 135, 136, 137, 138, 145, 146, 147, 148, 149, 150, 159, 160, 172, 173, 174, 177, 178, 179, 180, 181, 182
OFFSET
1,1
MAPLE
A074753 := proc(n) option remember ; local a, k ; a := 0 ; for k from 1 to n do if numtheory[sigma](k) < n then a := a+1 ; end if; end do ; a ; end proc: isA175091 := proc(n) return ( (A074753(n) mod 6 )in {2, 4}) ; end proc ; for n from 1 to 300 do if isA175091(n) then printf("%d, ", n) ; end if; end do ; # R. J. Mathar, Feb 08 2010
CROSSREFS
Cf. A074753.
Sequence in context: A333463 A310795 A310796 * A310797 A310798 A310799
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Jan 29 2010
EXTENSIONS
Corrected by R. J. Mathar, Feb 08 2010
STATUS
approved