A091012 Numbers having exactly one divisor d such that for some x also d-x and d+x are divisors.

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

Offset: 1

Author

Reinhard Zumkeller, Dec 13 2003

Keywords

• nonn

Comments

A091009(a(n)) = 1.

Crossrefs

Cf. A091013, A091011.