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A103511 Smallest prime > double factorial number A001147(n). 1
2, 5, 17, 107, 947, 10399, 135151, 2027033, 34459429, 654729139, 13749310577, 316234143227, 7905853580633, 213458046676877, 6190283353629379, 191898783962510743, 6332659870762850657, 221643095476699771957 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The Mathematica program ignores the first term.

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

1!!=1, 2 is the first prime greater than 1;

6!!=10395, 10399 is the first prime greater than 10395.

MATHEMATICA

nmax = 2^2048; npd = 1; n = 2; npd = npd*(2*n - 1); While[npd < nmax, cp = npd + 2; While[ ! (PrimeQ[cp]), cp = cp + 2]; Print[cp]; n = n + 1; npd = npd*(2*n - 1)]

CROSSREFS

Cf. A001147.

Sequence in context: A203006 A143878 A081546 * A254132 A161609 A228238

Adjacent sequences:  A103508 A103509 A103510 * A103512 A103513 A103514

KEYWORD

nonn

AUTHOR

Lei Zhou, Feb 15 2005

STATUS

approved

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Last modified January 23 07:07 EST 2020. Contains 331168 sequences. (Running on oeis4.)