A227534 Even numbers n such that the least e with n^e a totient is a new record.

2, 22, 34, 62, 86, 202, 398, 2042, 6998, 12514, 12758, 33406, 48962, 101554, 154186, 197378, 298366

Offset: 1

Author

Charles R Greathouse IV, Jul 14 2013

Keywords

• nonn
• hard

Comments

Essentially position of records in A227533.

Probably all terms beyond the first are even semiprimes: conjecturally this is a subsequence of A001747.

Crossrefs

Cf. A227533, A227535.

Programs

PARI

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

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