A227535 Exponents e such that n^e is the least totient for some even n and all even k < n have a totient of the form k^f for some f < e.

2, 3, 4, 5, 15, 17, 23, 42, 44, 47, 68, 80, 107, 130, 142, 162, 184

Offset: 1

Author

Charles R Greathouse IV, Jul 14 2013

Keywords

• nonn
• hard

Comments

Records in A227533.

Crossrefs

Cf. A227533, A227534.

Programs

PARI

r=0;forstep(n=2,1e5,2, t=1; while(!istotient(n^t++),); if(t>r, r=t;print1(t", ")))
\\ See also A227533 for a more efficient method of computing terms.

Formula

a(n) = A227533(A227534(n)/2).

Extensions

a(14) from Charles R Greathouse IV, Jul 16 2013

a(15) from Charles R Greathouse IV, Jul 17 2013

a(16)-a(17) from Charles R Greathouse IV, Jul 19 2013