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

1,1

Comments

Essentially position of records in A227533.

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

Links

Table of n, a(n) for n=1..17.

Prog

(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.

Crossrefs

Cf. A227533, A227535.

Sequence in context: A156441 A094625 A130751 * A126913 A019593 A060108

Adjacent sequences: A227531 A227532 A227533 * A227535 A227536 A227537

Keyword

nonn,hard

Author

Charles R Greathouse IV, Jul 14 2013

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

Status

approved