|
%I #5 Aug 03 2017 11:36:53
%S 5,5,9,75,862,9903,101030,1028263
%N The number of unitary untouchable numbers <= 10^n.
%C The unitary version of A057978. a(5)-a(8) were taken from the paper by Pomerance and Yang.
%H Carl Pomerance and Hee-Sung Yang, <a href="http://doi.org/10.1090/S0025-5718-2013-02775-5">Variant of a theorem of Erdős on the sum-of-proper-divisors function</a>, Mathematics of Computation, Vol. 83, No. 288 (2014), pp. 1903-1913.
%Y Cf. A057978, A063948.
%K nonn,more
%O 1,1
%A _Amiram Eldar_, Jul 24 2017
|
