A039774 - OEIS

A039774

phi(a(n)) is equal to the product of (the sum of prime factors and the sum of exponents) of (a(n)-1).

3, 5, 9, 25, 31, 57, 116, 144, 154, 288, 372, 414, 624, 792, 10032

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OFFSET

1,1

COMMENTS

Next term if it exists is greater than 100000.

LINKS

EXAMPLE

phi(25)=20, 24=2^3*3^1, (2+3)*(3+1)=20.

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved