A054984 Composite numbers x such that sigma(x + 6!) = sigma(x + 720) = sigma(x) + 720.

427, 553, 595, 623, 737, 871, 913, 923, 1199, 1207, 1241, 1507, 1582, 1817, 1848, 2193, 2226, 2337, 2398, 2407, 2553, 2561, 2728, 2758, 2929, 3016, 3115, 3248, 3346, 3502, 3503, 3598, 3705, 3762, 4171, 4293, 4343, 4462, 4587, 4633, 4841, 4867, 4984

Offset

1,1

Comments

See also A015914, A054799, A033560.

Links

Table of n, a(n) for n=1..43.

Example

553 is a term because sigma(553) + 720 = 640 + 720 = 1360 = sigma(553 + 720) = sigma(1273) = 1 + 19 + 67 + 1273.

Crossrefs

Cf. A015914, A015915, A015916, A015917, A054799.

Sequence in context: A173374 A227484 A272131 * A251147 A095811 A235217

Adjacent sequences: A054981 A054982 A054983 * A054985 A054986 A054987

Keyword

nonn

Author

Labos Elemer, May 29 2000

Status

approved