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 A226092 #16 May 10 2014 09:51:34 %S A226092 2401,279841,15752961,20151121,35153041,43046721,62742241,68574961, %T A226092 88529281,200533921,260144641,547981281,671898241,2385443281, %U A226092 2655237841,2750058481,2847396321,3262808641,3722098081,4640470641,5887339441,6414247921,8428892481,8882874001 %N A226092 Fourth powers that become prime when their most significant (leftmost) decimal digit is removed. %C A226092 This is to fourth powers A000583 as A226090 is to as cubes A000578, and as A225873 is to squares A000290. %e A226092 a(1) = 7^4 = 2401, because removing the leftmost digit (4) leaves 401, which is prime. %e A226092 a(2) = 23^4 = 279841, because removing the leftmost digit (2) leaves 79841, which is prime. %e A226092 a(3) = 63^4 = 15752961, because removing the leftmost digit (1) leaves 5752961, which is prime. %e A226092 a(10) = 119^4 = 200533921, because removing the leftmost digit (2) leaves 00533921 = 533921, which is prime. %t A226092 Select[Range[307]^4, PrimeQ@Mod[#, 10^IntegerLength@#/10] &] (* _Giovanni Resta_, May 26 2013 *) %Y A226092 Cf. A000583, A225873, A226090. %K A226092 nonn,base,easy %O A226092 1,1 %A A226092 _Jonathan Vos Post_, May 26 2013 %E A226092 a(13)-a(24) from _Giovanni Resta_, May 26 2013