A167748 - OEIS

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A167748

phi((n!!)!)

0

1, 1, 2, 9216, 250822656000, 1721860898320750629665025350129266874199532634112000000000000, 127571798940158944523056860801259448502131218787316228449430227816121623349001793754442941084615568218917882938952698416464702214493962240000000000000000000000000000000

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

Next term has 827 digits.

LINKS

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

MATHEMATICA

Table[EulerPhi[n!!! ], {n, 7}]

CROSSREFS

Sequence in context: A171939 A104904 A272247 * A203755 A285692 A340546

Adjacent sequences: A167745 A167746 A167747 * A167749 A167750 A167751

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Nov 10 2009

EXTENSIONS

Corrected by Charles R Greathouse IV, Nov 12 2009

STATUS

approved