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 A155053 #18 Mar 29 2014 05:21:33 %S A155053 5,7,11,13,19,29,31,37,41,43,47,53,67,79,83,89,97,101,113,127,157,163, %T A155053 167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257, %U A155053 263,269,271,277,281,283,293,307,311,313,317,331,347,349,353,359,379,397,409,421,431,433,439,443,449,467,479,491,523,541,557,563,569,571,577,601,613,617,619,641,643,647,653,673,677,683,691,701,709,719,727,743,751,757,761,769 %N A155053 Primes n with nonprime smallest digit of prime(n). %H A155053 Vincenzo Librandi, <a href="/A155053/b155053.txt">Table of n, a(n) for n = 1..1000</a> %e A155053 a(1) = 5 corresponds to the fact that the fifth prime is 11, the smallest digit of which is 1, which is nonprime. %e A155053 a(2) = 7: the seventh prime is 17, the smallest digit of which is 1, which is nonprime. %e A155053 a(3) = 11: the eleventh prime is 31, the smallest digit of which is 1, which is, again, nonprime. %t A155053 Select[Prime[Range[150]], !PrimeQ[Min[IntegerDigits[Prime[#]]]] &] (* _Harvey P. Dale_, Nov 25 2010 *) %Y A155053 Cf. A154981. %K A155053 nonn,base,less %O A155053 1,1 %A A155053 _Juri-Stepan Gerasimov_, Jan 19 2009 %E A155053 Corrected (19 inserted, 1673 replaced by 167) by _R. J. Mathar_, May 05 2010 %E A155053 More terms from _Harvey P. Dale_, Nov 25 2010