A145681 Numbers m such that A034448(m) = 3m/2, where A034448 = unitary sigma = sum of divisors d with gcd(d,m/d)=1.

2, 20, 24, 360, 816, 1056, 12240, 15840, 29120, 181632, 2724480, 9192960, 13790400, 15288000, 93358848, 199180800, 1130734080, 1400382720, 25115166720, 544161945600, 3089165506560, 11519246340096, 172788695101440, 274358081249280, 5944425093734400, 33746043993661440, 7425442423511040000, 25976914334122752000000, 48787315395486187520000, 56897897650906642513920

Offset

1,1

Comments

See also A144672, A144673 and A144674. These three and the present one all differ only by one or two terms around a(11)-a(12). More explanations would be welcome. - M. F. Hasler, Jan 29 2014

Links

Table of n, a(n) for n=1..30.

Y. Kohmoto, Unitary RMPN, SeqFan list, Jan. 2014

Crossrefs

Cf. A034448.

Sequence in context: A144674 A144673 A144672 * A108061 A154546 A108342

Adjacent sequences: A145678 A145679 A145680 * A145682 A145683 A145684

Keyword

nonn

Author

Yasutoshi Kohmoto Mar 09 2009

Extensions

Corrected and extended by Jack Brennen, Jan 30 2014

Status

approved