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 A167847 #13 Aug 03 2022 02:34:26 %S A167847 11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,4567, %T A167847 76543,23456789,1111111111111111111,11111111111111111111111 %N A167847 Straight-line primes. %C A167847 Prime numbers with 2 digits together with the primes whose digits are in arithmetic progression. The structure of digits represents a straight line. %C A167847 Note that in the graphic representation the points are connected by imaginary line segments (see also A135643). %C A167847 Note that all two-digit primes are straight-line primes but this sequence has no three-digit terms. %C A167847 No further terms between 23456789 and 115507867=prime(6600000). - _R. J. Mathar_, Dec 04 2009 %C A167847 All terms after 23456789 are repunit primes (A004022) with number of digits: 19, 23, 317, 1031, 49081, 86453, 109297, 270343, ... (A004023). - _Jens Kruse Andersen_, Jul 21 2014 %e A167847 The number 4567 is straight-line prime: %e A167847 . . . . %e A167847 . . . . %e A167847 . . . 7 %e A167847 . . 6 . %e A167847 . 5 . . %e A167847 4 . . . %e A167847 . . . . %e A167847 . . . . %e A167847 . . . . %e A167847 . . . . %Y A167847 Cf. A000040, A004022, A004023, A134811, A134951, A134971, A135643, A167841, A167842, A167843, A167844, A167845, A167846, A167853. %K A167847 base,nonn %O A167847 1,1 %A A167847 _Omar E. Pol_, Nov 14 2009 %E A167847 2 more terms from _R. J. Mathar_, Dec 04 2009 %E A167847 a(25)-a(26) from _Jens Kruse Andersen_, Jul 21 2014