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

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 A306838 A171879

Adjacent sequences: A039771 A039772 A039773 * A039775 A039776 A039777

Keyword

nonn

Author

Olivier Gérard

Status

approved