A217372 Initial prime in the first Ormiston n-tuple.

2, 1913, 11117123, 6607882123, 20847942560791

Offset: 1

Author

Jens Kruse Andersen, Oct 20 2012

Keywords

• nonn
• base
• hard

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.

Examples

			(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).
		

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.

Crossrefs

Cf. A069567 (Ormiston pairs), A075093 (triples), A161160 (quadruples), A217797 (5-tuples)