A067014 a(1)=1 and a(n+1)=phi(a(n))+a(phi(n)) for n>0.

1, 2, 2, 3, 4, 5, 6, 7, 9, 11, 13, 23, 25, 43, 47, 53, 59, 111, 77, 171, 115, 111, 83, 193, 199, 369, 263, 373, 395, 685, 551, 1189, 1173, 875, 653, 845, 647, 1491, 951, 825, 453, 1125, 623, 1653, 1179, 973, 939, 1597, 1649, 2661

Offset

1,2

Links

Table of n, a(n) for n=1..50.

Example

a(4)=phi(a(3))+a(phi(3))=phi(phi(a(2))+a(phi(2)))+a(2)=
=phi(phi(phi(a(1))+a(phi(1)))+a(1))+phi(a(1))+a(phi(1))=
=phi(phi(phi(1)+a(1))+1)+phi(1)+a(1)=
=phi(phi(1+1)+1)+1+1=phi(phi(2)+1)+2=phi(1+1)+2=1+2=3.

Crossrefs

Cf. A000010.

Sequence in context: A134345 A112193 A014215 * A096791 A199122 A086740

Adjacent sequences: A067011 A067012 A067013 * A067015 A067016 A067017

Keyword

nonn

Author

Reinhard Zumkeller, Feb 16 2002

Status

approved