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A030641 a(1) = 6; for n > 1, a(n) = product of next 2 primes after a(n-1). 2
6, 77, 6557, 43112347, 1858675670994257, 3454675249946148511864052376019, 11934781082590483693525046199489720199194471433440678070422853 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

The 2 primes after 77 are 79, 83, so next term is 79*83 = 6557.

MAPLE

A030641 := proc(n)

    option remember ;

    if n = 1 then

        6;

    else

        A030661(procname(n-1)) ;

    end if;

end proc:

seq(A030641(n), n=1..6) ;  # R. J. Mathar, Aug 09 2019

CROSSREFS

Cf. A030661, A030642.

Sequence in context: A154645 A299434 A301834 * A116280 A134788 A167498

Adjacent sequences:  A030638 A030639 A030640 * A030642 A030643 A030644

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 17 08:39 EST 2019. Contains 329217 sequences. (Running on oeis4.)