Numbers k such that k^k == -1 (mod phi(k)).

Terms

a(0) =1a(1) =2a(2) =3a(3) =15a(4) =87a(5) =255a(6) =11759a(7) =26279a(8) =39455a(9) =43919a(10) =65535a(11) =112895a(12) =443807a(13) =1347455a(14) =1464911a(15) =1568255a(16) =1604559a(17) =1968095a(18) =2441559a(19) =5948799a(20) =16210655a(21) =39624767a(22) =39839039a(23) =59187455a(24) =81624279a(25) =83623935a(26) =251009695a(27) =256685439a(28) =338979839a(29) =434357967