A069064 Integers which have at least two different factorizations into coprime parts whose sum are equal.

420, 546, 1260, 1365, 1950, 2310, 2730, 2964, 3990, 4095, 4218, 4284, 4290, 4420, 4510, 4620, 5100, 5460, 5610, 6006, 6090, 6160, 6270, 6370, 6510, 6930, 7140, 7161, 7350, 7410, 7440, 7590, 7980, 8190, 8580, 8645, 8970, 9100, 9240, 9282, 9394, 9660, 9690, 9870

Offset

1,1

Links

Table of n, a(n) for n=1..44.

Sean A. Irvine, Java program (github)

Example

420 is in the sequence as 5*4*21 = 3*7*20 = 420 and 5+4+21 = 30 = 3+7+20.
For 546, it is 546 = 3*7*26 = 2*13*21 and 3+7+26 = 36 = 2+13+21.
2964 is in the sequence as 3*19*52 = 4*13*57 = 2964 and 3+19+52 = 4+13+57 = 74. - Sean A. Irvine, Apr 01 2024

Crossrefs

Cf. A072940.

Sequence in context: A239253 A061118 A097822 * A024410 A200521 A350374

Adjacent sequences: A069061 A069062 A069063 * A069065 A069066 A069067

Keyword

easy,nonn

Author

Mike Domaratzki (domaratzki(AT)alumni.uwaterloo.ca), Aug 12 2002

Extensions

Missing 2964 and 7161 inserted by Sean A. Irvine, Apr 01 2024

Status

approved