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 A107036 #33 Aug 28 2024 10:55:14 %S A107036 3,4,5,7,11,13,17,19,23,31,43,61,79,101,127,167,191,199,313,347,701, %T A107036 1709,2617,3539,5807,10501,10691,11279,12391,14479,42737,83339,95369, %U A107036 117239,127031,138937,141079,267017,269987,374321,986191,4031399 %N A107036 Indices of prime Jacobsthal numbers. %C A107036 All terms are prime except a(1) = 4. All prime terms are listed in A000978. - _Alexander Adamchuk_, Oct 03 2006 %F A107036 a(n) = A000978(n-1) for n >= 3. - _Alexander Adamchuk_, Oct 03 2006 %o A107036 (PARI) is(n)=ispseudoprime((2^n - (-1)^n) / 3) \\ _Charles R Greathouse IV_, Apr 28 2015 %Y A107036 Cf. A000978, A001045, A001605. %K A107036 nonn,more %O A107036 1,1 %A A107036 _Paul Barry_, May 09 2005 %E A107036 More terms from _Alexander Adamchuk_, Oct 03 2006 %E A107036 a(41)-a(42) from _Bill McEachen_, Aug 28 2024