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A217372 Initial prime in the first Ormiston n-tuple. 1
2, 1913, 11117123, 6607882123, 20847942560791 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
An Ormiston n-tuple is n consecutive primes containing the same decimal digits in different order. a(5) found by Giovanni Resta. a(6) may be 166389896360719.
LINKS
Jens Kruse Andersen, Ormiston Tuples
A. Edwards, Ormiston Pairs, Australian Mathematics Teacher, Vol. 58, No. 2 (2002), pp 12-13.
E. W. Weisstein, Rearrangement Prime Pair at MathWorld.Wolfram.com.
EXAMPLE
(1913, 1931) is the first case of two consecutive primes with the same digits. The first 3-, 4- and 5-tuples are: (11117123, 11117213, 11117321), (6607882123, 6607882213, 6607882231, 6607882321), (20847942560791, 20847942560917, 20847942560971, 20847942561079, 20847942561097).
CROSSREFS
Cf. A069567 (Ormiston pairs), A075093 (triples), A161160 (quadruples), A217797 (5-tuples)
Sequence in context: A329663 A069793 A230082 * A160299 A232963 A238119
KEYWORD
nonn,base,hard
AUTHOR
Jens Kruse Andersen, Oct 20 2012
STATUS
approved

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Last modified March 2 21:56 EST 2024. Contains 370498 sequences. (Running on oeis4.)