1,1

If n = product p_i^a_i, d = product p_i^c_i is an infinitary divisor of n if each c_i has a zero bit in its binary representation everywhere that the corresponding a_i does.

G. L. Cohen, On an integer's infinitary divisors, Math. Comp. 54 (1990), 395-411.

J. O. M. Pedersen, Tables of Aliquot Cycles

Cf. A003416.

Sequence in context: A023002 A103716 A031530 this_sequence A066133 A119455 A045031

Adjacent sequences: A004604 A004605 A004606 this_sequence A004608 A004609 A004610

nonn,nice

njas