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 A160561 Cyclops primes with circular digits {0,6,8,9}. 2
 809, 66089, 68099, 86069, 88069, 89069, 99089, 6680689, 6680699, 6680969, 6690689, 6690899, 6690989, 6860869, 6860989, 6860999, 6890699, 6890969, 6960869, 6980669, 6980899, 6980969, 6990889, 8660689, 8660699, 8660969 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence is probably infinite. The sequence A134809 restricted to cases with digits 6, 8 or 9 (see A001743) at the off-center positions. Primes in A274765. - Omar E. Pol, Jul 06 2016 Each term is equal to 9 mod 10. - Harvey P. Dale, Feb 02 2021 LINKS Kenny Lau, Table of n, a(n) for n = 1..20000 MATHEMATICA Select[Prime@ Range[10^6], And[OddQ@ Length@ #, Times @@ Boole@ Map[MemberQ[{0, 6, 8, 9}, #] &, Union@ #] == 1, Part[#, Ceiling[Length[#]/2]] == 0, Count[#, 0] == 1] &@ IntegerDigits@ # &] (* Michael De Vlieger, Jul 05 2016 *) Table[Select[FromDigits/@(Flatten[Join[{Take[#, Length[#]/2], 0, Take[#, -Length[#]/2]}]]&/@Tuples[{6, 8, 9}, n]), PrimeQ], {n, 2, 6, 2}]//Flatten (* Harvey P. Dale, Feb 02 2021 *) CROSSREFS Intersection of A000040 (primes), A001743 (numbers with circular digits) and A134808 (cyclops numbers). Also intersection of A043580 (primes with circular digits) and A134809 (cyclops primes). Cf. A134808, A134809, A153807, A156200, A274765. Sequence in context: A031599 A265984 A332848 * A346716 A156404 A282376 Adjacent sequences: A160558 A160559 A160560 * A160562 A160563 A160564 KEYWORD nonn,base AUTHOR Ki Punches, May 19 2009 EXTENSIONS Edited and corrected by Ray Chandler and R. J. Mathar, May 20 2009 Definition simplified by Omar E. Pol, Jun 05 2009 STATUS approved

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Last modified September 16 20:35 EDT 2024. Contains 375977 sequences. (Running on oeis4.)