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A089360 Prime worms. 0

%I #6 Mar 31 2012 10:32:39

%S 101,131,151,181,191,313,353,373,383,727,757,787,797,919,929,12101,

%T 14741,18181,32323,34543,35353,35753,72727,74747,75797,78787,79757,

%U 94949,95959,97579,1012321,1212121,1414741,1474141,1616161,3131353

%N Prime worms.

%C While some palindromic primes are included, there are other criteria for addition to this sequence.

%D Carlos Rivera's primepuzzles.net, Puzzle 246

%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_246.htm">Puzzle 246. The worms </a>

%F From sequence of primes beginning with 3-digits, select those with identical first and last digits; no adjacent digits identical; and absolute value of sequential differences of paired digits a constant.

%e a(15)=12101; first and last digits = 1; no identical adjacent digits; abs(1-2)=1;abs(2-1)=1; abs(1-0)=1; abs(0-1)=1; the worm is 1.

%Y Cf. A089291, A089315-89317, A048398-48405.

%K easy,nonn,base

%O 1,1

%A _Enoch Haga_, Dec 27 2003

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Last modified April 18 06:12 EDT 2024. Contains 371769 sequences. (Running on oeis4.)