A143719 - OEIS

%I #5 Jan 06 2021 22:25:18

%S 1,2,3,4,5,6,7,10,11,12,13,14,15,17,19,20,21,22,23,24,26,28,29,30,31,

%T 33,34,35,36,37,38,39,41,42,43,44,46,47,48,51,52,53,55,57,58,59,61,62,

%U 65,66,67,68,69,70,71,72,73,74,76,77,78,79,82,83,85,86,87,89,91,92,93,94,95,97,100

%N Let n = Product_{p} p ^ e_p be the prime factorization of n and let M = max{e_p}. Then n is in the sequence iff for all primes q in the range 2 <= q <= M we have e_q >= Sum_{r} floor( log_q (e_r + 1) ).

%C A variant of A141586, which is a subsequence.

%Y Cf. A141586, A135130, A143720.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Nov 29 2008