A086860 - OEIS

A086860

Numbers in A086473 corresponding to the unique product of two numbers having the unique sum of A086533.

52, 244, 1168, 1776, 4672, 4192, 2608, 724, 8128, 916, 1912, 3328, 15424, 9952, 3352, 3592, 53632, 80128, 36352, 51712, 65152, 5272, 20512, 72832, 22432, 111756, 133888, 84352, 6472, 48448, 26272, 172288, 107392, 37480, 187648, 242496

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OFFSET

1,1

COMMENTS

Related to Martin Gardner's "Impossible Problem".

a(n) is thus a subsequence of A086473, itself a subsequence of A058080. Consider the mapping f:P->S defined thus: S is the sum of a factor pair (both different from 1) of P, where P is a(n). If S is A086533(n) (a subsequence of A014092), then both f and its inverse are injective (but not onto).

LINKS

Table of n, a(n) for n=1..36.

CROSSREFS

Cf. A086533.

Sequence in context: A251287 A023417 A122239 * A070147 A236517 A320556

Adjacent sequences: A086857 A086858 A086859 * A086861 A086862 A086863

KEYWORD

nonn

AUTHOR

Lekraj Beedassy, Sep 12 2003

EXTENSIONS

Corrected by Ray Chandler, Oct 23 2003

STATUS

approved