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A230810
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Smallest of 3 consecutive odd numbers that are primes or strong pseudoprime to base 2.
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2
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OFFSET
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1,1
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COMMENTS
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Since a(7) = a(6) + 2, the number a(6) = 1640293473202755797 actually starts a sequence of four consecutive odd numbers which are prime or strong pseudoprimes to base 2. - M. F. Hasler, Dec 08 2016
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LINKS
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Table of n, a(n) for n=1..8.
S. S. Gupta, Can You Find no. 48, Oct. 2016.
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EXAMPLE
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3465253618399 is in sequence because 3465253618399, 3465253618401, 3465253618403 is a set of 3 consecutive odd number where 3465253618401 is strong pseudoprime base 2 and others are prime.
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CROSSREFS
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Cf. A001262, A001567, A230667, A230808.
Sequence in context: A260002 A058447 A275939 * A266199 A216148 A058453
Adjacent sequences: A230807 A230808 A230809 * A230811 A230812 A230813
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KEYWORD
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nonn,hard,more
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AUTHOR
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Shyam Sunder Gupta, Oct 30 2013
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EXTENSIONS
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Edited by M. F. Hasler, Dec 08 2016
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STATUS
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approved
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