A033910 Numbers k such that s(k) + s(k+1) + s(k+2) = t(k) + t(k+1) + t(k+2) where s(k) = sigma(k) - k, t(k) = |s(k) - k|.

7, 27, 383, 1767, 2059, 2239, 6591, 24079, 46591, 62847, 95767, 496083, 10397407, 14348907, 32822543, 183668391, 525969735, 1495596183, 2819404431, 5452084351, 6141845439, 7949695103, 18352366175, 20538294335

Offset

1,1

Comments

a(25) > 10^11. - Donovan Johnson, Aug 15 2011

Links

Table of n, a(n) for n=1..24.

Example

s(383) = sigma(383) - 383=1, s(384) = sigma(384) - 384 = 636, s(385) = sigma(385) - 385 = 191, s(383) + s(384) + s(385) = 828, t(383) = |383 - 1| = 382, t(384) = |384 - 636| = 252, t(385) = |385 - 191| = 194, 382 + 252 + 194 = 828.

Crossrefs

Cf. A001065, A033880.

Sequence in context: A173193 A196323 A003148 * A196647 A274579 A152578

Adjacent sequences: A033907 A033908 A033909 * A033911 A033912 A033913

Keyword

nonn,more

Author

Naohiro Nomoto

Extensions

More terms from Jud McCranie, Jul 14 2000

Missing term 6591 added and a(20)-a(24) from Donovan Johnson, Aug 15 2011

Status

approved