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A092025 Numbers n such that the concatenation of the first n natural numbers plus prime(n) is prime. 0
1, 44, 66, 398, 1582, 2484 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For n > 1, a(n) is even.

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

66 is in the sequence because 1.2.3...65.66 + prime(66) is prime.

CROSSREFS

Sequence in context: A067737 A217218 A111494 * A250329 A242515 A156812

Adjacent sequences:  A092022 A092023 A092024 * A092026 A092027 A092028

KEYWORD

more,nonn,base

AUTHOR

Farideh Firoozbakht, Feb 19 2004

EXTENSIONS

Edited by Charles R Greathouse IV, Apr 29 2010

a(6) from Max Alekseyev, Jan 28 2012

STATUS

approved

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Last modified January 18 04:47 EST 2019. Contains 319269 sequences. (Running on oeis4.)