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A130774 Cumulative concatenation of A000204 Lucas numbers (beginning at 1). 4
1, 13, 134, 1347, 134711, 13471118, 1347111829, 134711182947, 13471118294776, 13471118294776123, 13471118294776123199, 13471118294776123199322, 13471118294776123199322521, 13471118294776123199322521843 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(2) = 13 is prime. a(10) = 13471118294776123 is prime. What is the next prime?

The next prime is a(31), a number of 120 digits. - Giovanni Resta, Jun 18 2016

LINKS

Table of n, a(n) for n=1..14.

FORMULA

a(1) = 1; a(n+1) = Concatenate(a(n),A000204(n+1)).

CROSSREFS

Cf. A000204.

Sequence in context: A262572 A132935 A132930 * A179619 A019519 A243216

Adjacent sequences:  A130771 A130772 A130773 * A130775 A130776 A130777

KEYWORD

base,easy,nonn

AUTHOR

Jonathan Vos Post, Aug 19 2007

STATUS

approved

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Last modified September 19 15:09 EDT 2020. Contains 337178 sequences. (Running on oeis4.)