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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 (list; graph; refs; listen; history; text; internal format)
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: A127306 A319184 A231959 * 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 February 19 00:51 EST 2020. Contains 332028 sequences. (Running on oeis4.)