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A103861
Euler's totient of prime(n)! - prime(n)# + 1.
3
1, 1, 72, 4830, 39899952, 6226593544, 355687354472272, 121615851757531824, 25500701524255140352000, 8839501251731586459279018676600, 8202317101101304783411826869132800
OFFSET
1,3
LINKS
Reinhard Zumkeller, p(n)!-p(n )#+1
FORMULA
a(n) = A000010(A103855(n)).
MATHEMATICA
EulerPhi[Table[Prime[n]! - Product[Prime[i], {i, 1, n}] + 1, {n, 1, 10}] ](* Amiram Eldar, Feb 21 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Feb 20 2005
STATUS
approved