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 A195327 #15 May 09 2021 02:17:35 %S A195327 2,4,8,16,36,40,48,100,144,324,484,900,1296,1764,2116,2704,3600,6084, %T A195327 9216,13728,19044,24336,30000,39204,39360,44100,51984,63888,72900, %U A195327 81648,93636,108900,112896,133956,142884,191844,229376,248004,269568,298116 %N A195327 Number of bases to which terms of A194946 are pseudoprime. %H A195327 Charles R Greathouse IV, <a href="/A195327/b195327.txt">Table of n, a(n) for n = 1..659</a> %H A195327 <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a> %o A195327 (PARI) bases(n)=my(f=factor(n)[, 1]); n--; prod(i=1, #f, gcd(f[i]-1, n)) \\ Given a value of A194946, this function transforms it to a term of this sequence. %Y A195327 Cf. A194946, A195328. %K A195327 nonn %O A195327 1,1 %A A195327 _Charles R Greathouse IV_, Sep 15 2011