A091012 - OEIS

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A091012

Numbers having exactly one divisor d such that for some x also d-x and d+x are divisors.

3

6, 15, 28, 40, 91, 153, 190, 220, 325, 496, 544, 561, 572, 627, 703, 861, 897, 935, 946, 1012, 1225, 1287, 1292, 1431, 1581, 1610, 1653, 1768, 1891, 2278, 2300, 2465, 2618, 2701, 2967, 3321, 3344, 3496, 3596, 3655, 3952, 4123, 4301, 4324, 4371

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OFFSET

1,1

COMMENTS

A091009(a(n)) = 1.

LINKS

Table of n, a(n) for n=1..45.

CROSSREFS

Cf. A091013, A091011.

Sequence in context: A242454 A161777 A117519 * A241988 A058008 A094142

Adjacent sequences: A091009 A091010 A091011 * A091013 A091014 A091015

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Dec 13 2003

STATUS

approved