A168145 Numbers n such that to abs(phi(n) - pi(n)) = 1.

1, 5, 6, 12, 18, 24, 36, 42, 48, 60, 84

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