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A030642 Product of next 2 primes. 2
2, 15, 323, 111547, 12449873237, 154999344563559225589, 24024796815132956872884975543558130445497 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

FORMULA

a(n) = A030661(a(n-1)). - R. J. Mathar, Aug 09 2019

MAPLE

A030642 := proc(n)

    option remember ;

    if n = 1 then

        2;

    else

        A030661(procname(n-1)) ;

    end if;

end proc:

seq(A030642(n), n=1..6) ;  R. J. Mathar, Aug 09 2019

MATHEMATICA

NestList[NextPrime[#] NextPrime[NextPrime[#]]&, 2, 10] (* Harvey P. Dale, Jul 26 2017 *)

CROSSREFS

Cf. A000040, A030641.

Sequence in context: A003025 A015200 A331344 * A297077 A175563 A231443

Adjacent sequences:  A030639 A030640 A030641 * A030643 A030644 A030645

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 15 16:02 EDT 2020. Contains 336505 sequences. (Running on oeis4.)