login
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
OFFSET
1,1
COMMENTS
Records in A227533.
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
Sequence in context: A199165 A202423 A171593 * A096774 A201356 A183528
KEYWORD
nonn,hard
AUTHOR
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