id:A153434 - OEIS Search Results

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a(n) is the smallest number m such that all n numbers m+1, m.m+1, ..., m.m. ... .m+1 are prime, where dot means concatenation.

+0
2

1, 2, 2, 42, 42, 1179990, 243464796 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`All 5 numbers 1+42,1+4242,1+424242,1+42424242 & 1+4242424242 are prime and 42` `is the smallest such number so a(5)=42.`
	CROSSREFS	`Cf. A153435.` `Sequence in context: A001121 A116567 A087541 this_sequence A152016 A156467 A015167` `Adjacent sequences: A153431 A153432 A153433 this_sequence A153435 A153436 A153437`
	KEYWORD	`base,more,nonn`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Apr 01 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.