Thanks to everyone who made a donation during our annual appeal! To see the list of donors, or make a donation, see the OEIS Foundation home page.
0,2
Such k must be an odd squarefree number.
Conjecture: the sequence is infinite.
a(4) > 10^10 if it exists. - Charles R Greathouse IV, Nov 28 2017
Table of n, a(n) for n=0..3.
Subsequence of A236423(n+1)/2 for n > 0.
Cf. A295124.
Sequence in context: A012804 A012837 A036778 * A065400 A091470 A028567
Adjacent sequences: A295166 A295167 A295168 * A295170 A295171 A295172
nonn,more
Thomas Ordowski, Nov 16 2017
a(3) from Paolo P. Lava, Nov 16 2017
approved