

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



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

1,1


COMMENTS

Records in A227533.


LINKS

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


FORMULA

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


PROG

(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.


CROSSREFS

Cf. A227533, A227534.
Sequence in context: A199165 A202423 A171593 * A096774 A201356 A183528
Adjacent sequences: A227532 A227533 A227534 * A227536 A227537 A227538


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



