0,2

Conjecture: for n>1 this is A050804.

Conjecture: sequence consists of numbers of form 2*k^2 such that sigma(2*k^2)==3 (mod 4) and k is not divisible by 5.

Cf. A050804.

Adjacent sequences: A081321 A081322 A081323 this_sequence A081325 A081326 A081327

Sequence in context: A074629 A001105 A051787 this_sequence A050804 A018229 A072779

nonn

Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 20 2003