1,3

Table of n, a(n) for n=1..80.

Eric Weisstein's World of Mathematics, Prime Power

n=7, A000961(7)=8=2^3: (3+13)/2=(A000961(3)+A000961(10))/2, (5+11)/2=(A000961(5)+A000961(9))/2 and (7+3^2)/2=(A000961(6)+A000961(8))/2: therefore a(7)=3.

Cf. A000961, A071681.

Sequence in context: A000121 A230022 A049846 * A125842 A029865 A211190

Adjacent sequences: A086709 A086710 A086711 * A086713 A086714 A086715

nonn

Reinhard Zumkeller, Aug 01 2003

approved