A073921 Odd numbers which retain their position in the rearrangement of A073920: terms of A073920 for which a(n) = 2n-1.

1, 41, 43, 45, 47

Offset

1,2

Comments

No further term below 21000000. Sequence is probably finite because the preferential placement of primes at earlier places than nonprimes in A073920 leads to 2 clearly separated branches in the plot of A073920 as a result of the prime number theorem. This leaves a void in between, in which the current sequence fails to find more points. - R. J. Mathar, Feb 13 2008

Links

Table of n, a(n) for n=1..5.

Formula

{2n-1: A073920(n)=2n-1}. - R. J. Mathar, Feb 13 2008

Crossrefs

Cf. A073920.

Sequence in context: A283598 A041839 A098064 * A118124 A054057 A282319

Adjacent sequences: A073918 A073919 A073920 * A073922 A073923 A073924

Keyword

more,nonn

Author

Amarnath Murthy, Aug 19 2002

Status

approved