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Search: id:A089360
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| 101, 131, 151, 181, 191, 313, 353, 373, 383, 727, 757, 787, 797, 919, 929, 12101, 14741, 18181, 32323, 34543, 35353, 35753, 72727, 74747, 75797, 78787, 79757, 94949, 95959, 97579, 1012321, 1212121, 1414741, 1474141, 1616161, 3131353
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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While some palindromic primes are included, there are other criteria for addition to this sequence.
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REFERENCES
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Carlos Rivera's primepuzzles.net, Puzzle 246
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LINKS
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Carlos Rivera, Puzzle 246. The worms
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FORMULA
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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.
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EXAMPLE
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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.
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CROSSREFS
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Cf. A089291, A089315-89317, A048398-48405.
Sequence in context: A052086 A056730 A077798 this_sequence A056728 A085112 A059758
Adjacent sequences: A089357 A089358 A089359 this_sequence A089361 A089362 A089363
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KEYWORD
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easy,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Dec 27 2003
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