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A074349 a(1)=1, a(n) is smallest number > a(n-1) such that all pair juxtapositions a(1)a(n),...,a(n-1)a(n) are primes. 0
1, 3, 7, 97, 187, 1699, 190699 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

What is the next term? Is this sequence infinite?

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

all 21 pair mergers: {13, 17, 197, 1187, 11699, 1190699}, {37, 397, 3187, 31699, 3190699}, {797, 7187, 71699, 7190699}, {97187, 971699, 97190699}, {1871699, 187190699} and 1699190699 are primes.

CROSSREFS

Sequence in context: A177495 A088419 A062592 * A159310 A299377 A129660

Adjacent sequences:  A074346 A074347 A074348 * A074350 A074351 A074352

KEYWORD

nonn,base

AUTHOR

Zak Seidov, Sep 23 2002

STATUS

approved

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Last modified February 19 04:09 EST 2020. Contains 332037 sequences. (Running on oeis4.)