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 A167188 #11 Jul 27 2024 13:54:57 %S A167188 1,4,9,16,32,81,128,169,361,1024,1369,2401,4489,5329,6889,8192,12769, %T A167188 19683,32768,39601,44521,85849,177241,218089,262144,279841,436921, %U A167188 597529,744769,786769,1142761,1771561,5340721,6135529,8826841,10699441,17447329,18464209 %N A167188 Smaller prime power associated with record gap in A167186. %H A167188 Donovan Johnson, <a href="/A167188/b167188.txt">Table of n, a(n) for n = 1..200</a> %e A167188 32 is in the sequence since the gap between 32 and the next prime power, 49, is greater than any previous gap. %o A167188 (PARI) isA025475(n) = (omega(n) == 1 & !isprime(n)) || (n == 1) %o A167188 d_max=0;n_prev=1;for(n=2,32e6,if(isA025475(n),d=n-n_prev;if(d>d_max,print(n_prev);d_max=d);n_prev=n)) %Y A167188 Larger prime power: A167189. %Y A167188 Record gaps between nonprime prime powers: A167186. %Y A167188 Gaps between nonprime prime powers: A053707. %Y A167188 List of nonprime prime powers: A025475. %K A167188 nonn %O A167188 1,2 %A A167188 _Michael B. Porter_, Nov 01 2009