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A039788
phi(a(n)) is equal to the product of (the sum of prime factors and the sum of exponents) of (a(n)).
0
9, 16, 35, 45, 150, 154, 234, 264
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OFFSET
1,1
COMMENTS
Next term if it exists is greater than 10000000.  C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 29 2004
LINKS
Table of n, a(n) for n=1..8.
EXAMPLE
phi(45)=24, 45=3^2*5^1, (3+5)*(2+1)=24.
PROG
(PARI) for(n=1, 10000000, f=factor(n); l=#f[, 1]; if(eulerphi(n)==sum(i=1, l, f[i, 1])*sum(i=1, l, f[i, 2]), print1(n, ", "))) (Ronaldo)
CROSSREFS
Cf.
A000010
,
A039697
.
Sequence in context:
A369642
A162616
A153362
*
A175652
A348233
A110833
Adjacent sequences:
A039785
A039786
A039787
*
A039789
A039790
A039791
KEYWORD
nonn
,
more
AUTHOR
Olivier Gérard
STATUS
approved
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Last modified May 25 03:39 EDT 2024. Contains 372782 sequences. (Running on oeis4.)