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A269564
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Seven-digit primes whose first, third, fifth, and seventh digits are the same.
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2
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1010131, 1011191, 1012171, 1014121, 1014131, 1014161, 1015171, 1016111, 1017131, 1110181, 1111151, 1111181, 1112131, 1112141, 1112171, 1113181, 1114111, 1115131, 1117111, 1118101, 1119121, 1210151, 1211141, 1211191, 1212121, 1212191, 1213141, 1213151
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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There are 598 such primes.
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LINKS
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Harvey P. Dale, Table of n, a(n) for n = 1..598
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EXAMPLE
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7671737 is a prime and its first, third, fifth, and seventh digits are the same.
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MATHEMATICA
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Table[Select[Prime[Range[PrimePi[i*10^6]+1, PrimePi[i*10^6+ 10^6-1]]], MatchQ[ IntegerDigits[#], {x_, _, x_, _, x_, _, x_}]&], {i, {1, 3, 7, 9}}] //Flatten
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CROSSREFS
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Cf. A269066.
Sequence in context: A306515 A306517 A043643 * A096931 A210274 A252916
Adjacent sequences: A269561 A269562 A269563 * A269565 A269566 A269567
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KEYWORD
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nonn,base,fini,full
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AUTHOR
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Harvey P. Dale, Feb 29 2016
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STATUS
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approved
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