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Search: id:A086244
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| A086244 |
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Primes such that a sum of any two adjacent digits is prime; first and last digits are considered adjacent. |
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+0
3
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| 11, 23, 29, 41, 43, 47, 61, 67, 83, 89, 211, 2029, 2111, 2129, 2141, 2143, 2161, 2341, 2383, 2389, 2503, 2521, 4111, 4129, 4349, 4703, 4943, 6121, 6521, 6761, 8329, 8389, 8923, 8929, 11161, 11411, 12161, 12941, 14321, 14341, 14741, 16111, 16141, 16561, 16741, 20323, 20341, 20389, 20521, 20743, 20749, 21121, 21143, 21149, 21211, 21611, 23021, 23029, 23203, 29411
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Each (2- or more-digit) term must begin with one of the even digits 2,4,6,8 or else must begin and end with the digit 1. All repunit primes (A004022) are terms as the sums are always 2.
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EXAMPLE
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2029 is a term because it is a prime and 2+0, 0+2, 2+9, 9+2 are all primes.
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CROSSREFS
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Sequence in context: A091367 A088136 A164932 this_sequence A091939 A166559 A072185
Adjacent sequences: A086241 A086242 A086243 this_sequence A086245 A086246 A086247
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KEYWORD
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easy,base,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Jul 13 2003
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EXTENSIONS
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Corrected and extended by Rick L. Shepherd (rshepherd2(AT)hotmail.com), Feb 11 2004
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