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A039774 phi(a(n)) is equal to the product of (the sum of prime factors and the sum of exponents) of (a(n)-1). 0
3, 5, 9, 25, 31, 57, 116, 144, 154, 288, 372, 414, 624, 792, 10032 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Next term if it exists is greater than 100000.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

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

CROSSREFS

Cf. A000010, A039697.

Sequence in context: A083366 A006722 A251413 * A114001 A171879 A171877

Adjacent sequences:  A039771 A039772 A039773 * A039775 A039776 A039777

KEYWORD

nonn

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified November 18 07:01 EST 2018. Contains 317279 sequences. (Running on oeis4.)