0,1

Table of n, a(n) for n=0..73.

F. Firoozbakht, M. F. Hasler, Variations on Euclid's formula for Perfect Numbers, JIS 13 (2010) #10.3.1

a(5) = 9 because the first 5 in A033879 is A033879(9).

Cf. A082731.

Cf. A001065, A033879.

Sequence in context: A156792 A021624 A021066 * A010136 A087256 A154911

Adjacent sequences: A082727 A082728 A082729 * A082731 A082732 A082733

nonn

Amarnath Murthy, Apr 14 2003

More terms from David Wasserman, Sep 29 2004, who remarks that he searched up to 10^16.

approved