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A084559 Smallest a(n) > n such that concatenation of numbers from n to a(n) is a prime. 0
3, 19, 7, 17, 7, 13, 9, 187 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

Terms a(1) and a(10) are currently unknown.

a(11) = 309, a(12) = 13.

a(1) > 344869. - Sean A. Irvine, Jun 17 2019

LINKS

Table of n, a(n) for n=2..9.

Eric Weisstein's World of Mathematics, Consecutive Number Sequences.

Eric Weisstein's World of Mathematics, Smarandache Prime

EXAMPLE

a(4) = 7 because 4567 is a prime.

CROSSREFS

Cf. A030458, A030471, A052087, A052088, A052089.

Sequence in context: A258007 A293700 A114365 * A272815 A179767 A244605

Adjacent sequences:  A084556 A084557 A084558 * A084560 A084561 A084562

KEYWORD

nonn,base,hard,more

AUTHOR

Zak Seidov, Jun 27 2003

EXTENSIONS

Edited by Max Alekseyev, Jan 28 2012

a(4) corrected by Daniel Suteu, Jun 16 2019

STATUS

approved

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Last modified September 23 02:49 EDT 2020. Contains 337291 sequences. (Running on oeis4.)