cp's OEIS Frontend

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.

A062334 Primes starting and ending with 7.

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%I A062334 #12 Sep 17 2024 12:34:47
%S A062334 7,727,757,787,797,7027,7057,7127,7177,7187,7207,7237,7247,7297,7307,
%T A062334 7417,7457,7477,7487,7507,7517,7537,7547,7577,7607,7687,7717,7727,
%U A062334 7757,7817,7867,7877,7907,7927,7937,70067,70117,70157,70177,70207,70237
%N A062334 Primes starting and ending with 7.
%H A062334 Harry J. Smith, <a href="/A062334/b062334.txt">Table of n, a(n) for n = 1..1000</a>
%e A062334 7687 is a member, as it is a prime and the first and the last digits are both 7.
%o A062334 (PARI) { default(primelimit, 800000); n=-1; t=log(10); forprime (p=2, 800000, if ((p-10*(p\10)) == 7 && (p\10^(log(p)\t)) == 7, write("b062334.txt", n++, " ", p); if (n==1000, break)) ) } \\ _Harry J. Smith_, Aug 05 2009
%Y A062334 Cf. A062332, A062333, A062335.
%K A062334 nonn,base,easy
%O A062334 1,1
%A A062334 _Amarnath Murthy_, Jun 21 2001
%E A062334 More terms from Larry Reeves (larryr(AT)acm.org), Jun 29 2001
%E A062334 Offset changed by _Andrew Howroyd_, Sep 17 2024