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A227534 Even numbers n such that the least e with n^e a totient is a new record. 2
2, 22, 34, 62, 86, 202, 398, 2042, 6998, 12514, 12758, 33406, 48962, 101554, 154186, 197378, 298366 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 22 15:57 EST 2019. Contains 319364 sequences. (Running on oeis4.)