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A139190 a(n) = (prime(n)!-2)/2. 18
0, 2, 59, 2519, 19958399, 3113510399, 177843714047999, 60822550204415999, 12926008369442488319999, 4420880996869850977271807999999, 4111419327088961408862781439999999, 6881876545613172523157989790790451199999999, 16726263306581903554085031026720375832575999999999, 30207631531686917818677566034256998753632255999999999, 129311620755584090321482177576805989984598816194559999999999, 2137441642030012782149006876694699824845171894183406862335999999999999 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..85

FORMULA

a(n) = (A139189(n)-1)/2. - R. J. Mathar, May 25 2008

MATHEMATICA

Table[(Prime[n]! - 2)/2, {n, 1, 20}]

PROG

(PARI) a(n) = (prime(n)!-2)/2 \\ Charles R Greathouse IV, Apr 29 2015

CROSSREFS

Cf. A139189, A139190, A139191, A139192, A139193, A139194, A139195, A139196, A139197, A139198.

Sequence in context: A051055 A003827 A241324 * A050283 A096758 A262638

Adjacent sequences:  A139187 A139188 A139189 * A139191 A139192 A139193

KEYWORD

nonn

AUTHOR

Artur Jasinski, Apr 11 2008

EXTENSIONS

More terms from R. J. Mathar, May 25 2008

STATUS

approved

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Last modified August 26 02:19 EDT 2019. Contains 326324 sequences. (Running on oeis4.)