OFFSET
0,1
COMMENTS
This sequence is one of the first ones that contains numbers that exceed 2^64 and yet is known to terminate in a small prime followed by 1 and 0.
Note how all the numbers in the sequence are even, except the last 6 (not counting 0).
REFERENCES
R. K. Guy, Unsolved Problems in Number Theory, B6.
Enoch Haga, Exploring Prime Numbers on Your PC, 2nd ed., 1998, pages 83-84 and Table 8, page 46. ISBN 1-885794-16-9.
LINKS
Daniel Mondot, Table of n, a(n) for n = 0..301
FORMULA
a(n+1) = A001065(a(n)). - R. J. Mathar, Oct 11 2017
MATHEMATICA
NestWhileList[DivisorSigma[1, #]-#&, 702, #>0&] (* Paolo Xausa, Oct 16 2023 *)
PROG
(PARI) lista() = {print1(a=702, ", "); until (!a, a = sigma(a) - a; print1(a, ", "); ); } \\ Michel Marcus, Feb 29 2016
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
Daniel Mondot, Feb 29 2016
STATUS
approved