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A168145
Numbers n such that to abs(phi(n) - pi(n)) = 1.
0
1, 5, 6, 12, 18, 24, 36, 42, 48, 60, 84
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OFFSET
1,2
COMMENTS
No more terms between 84 and 120000. -
R. J. Mathar
, Jun 04 2010
LINKS
Table of n, a(n) for n=1..11.
FORMULA
Solutions to
A000010
(x)=
A000720
(x)+k where k=+-1; finite for any fixed value of k.
EXAMPLE
15 primes below 48=(2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47); 16 terms in RRS(48)=(1, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 35, 37, 41, 43, 47), so 48 is here.
CROSSREFS
Cf.
A000010
,
A000720
,
A037121
,
A037228
,
A073456
.
Sequence in context:
A319184
A231959
A362948
*
A276407
A022310
A126593
Adjacent sequences:
A168142
A168143
A168144
*
A168146
A168147
A168148
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov
, Nov 19 2009
EXTENSIONS
Corrected (42 inserted) by
R. J. Mathar
, Jun 04 2010
STATUS
approved
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Last modified August 23 04:29 EDT 2024. Contains 375375 sequences. (Running on oeis4.)