A074349 - OEIS

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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.

1, 3, 7, 97, 187, 1699, 190699, 9014587, 15840271, 424390927, 7945288741

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OFFSET

1,2

COMMENTS

What is the next term? Is this sequence infinite?

LINKS

Table of n, a(n) for n=1..11.

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 A362682 A299377

Adjacent sequences: A074346 A074347 A074348 * A074350 A074351 A074352

KEYWORD

nonn,base,more

AUTHOR

Zak Seidov, Sep 23 2002

EXTENSIONS

a(8)-a(10) from Bill McEachen, Jul 28 2024

a(11) from Michael S. Branicky, Jul 29 2024

STATUS

approved