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 A212178 #15 Dec 30 2020 04:12:10 %S A212178 0,0,1,0,1,1,1,1,0,1,2,1,1,1,2,1,1,1,2,2,1,0,2,1,1,2,2,1,1,2,1,1,2,2, %T A212178 1,1,2,3,1,1,2,2,2,2,2,1,1,2,3,1,1,2,2,0,2,2,2,1,1,2,3,1,1,2,2,1,2,2, %U A212178 3,2,1,3,2,1,2,3,2,1,2,1,2,2,1,2,2,3,2,1 %N A212178 Number of exponents >= 2 in canonical prime factorization of A025487(n) (first integer of each prime signature). %C A212178 Length of row n of A212175 equals a(n) if a(n) is positive, 1 otherwise. %H A212178 Amiram Eldar, <a href="/A212178/b212178.txt">Table of n, a(n) for n = 1..10000</a> %H A212178 Will Nicholes, <a href="http://willnicholes.com/math/primesiglist.htm">Prime Signatures</a> %H A212178 <a href="/index/Pri#prime_signature">Index entries for sequences related to prime signature</a> %F A212178 a(n) = A056170(A025487(n)). %e A212178 The canonical prime factorization of 24 (2^3*3) has 1 exponent that equals or exceeds 2. Since 24 = A025487(8), a(8) = 1. %Y A212178 Cf. A025487, A212172. %K A212178 nonn %O A212178 1,11 %A A212178 _Matthew Vandermast_, Jun 04 2012