This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A177512 #16 Sep 15 2019 07:56:49
%S A177512 1,2,5,7,11,13,17,19,23,25,29,31,37,41,43,47,49,53,59,61,67,71,73,79,
%T A177512 83,89,97,101,103,107,109,113,121,127,131,137,139,149,151,157,163,167,
%U A177512 169,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251
%N A177512 A053735-deficient numbers.
%C A177512 For definition, see A175522.
%C A177512 All primes, except for 3, are in the sequence.
%C A177512 It also contains squared primes p^2 for p = 5, 7, 11, 13, 19, 23, 29, 31, 37.. (not matching current OEIS sequences). What characterizes these p?
%H A177512 Amiram Eldar, <a href="/A177512/b177512.txt">Table of n, a(n) for n = 1..10000</a>
%F A177512 {n: sum_{d|n, d<n} A053735(d) < A053735(n)}.
%o A177512 (Sage) is_A177512 = lambda n: sum(A053735(d) for d in divisors(n)) < 2*A053735(n) # _D. S. McNeil_, Dec 11 2010
%o A177512 (PARI) isok(n) = sumdiv(n, d, (d<n)* vecsum(digits(d,3))) < vecsum(digits(n, 3)); \\ _Michel Marcus_, Feb 06 2016
%Y A177512 Cf. A177511 (perfect version), A175524, A175811, A000040, A005100, A005101.
%K A177512 nonn,base
%O A177512 1,2
%A A177512 _Vladimir Shevelev_, Dec 11 2010