login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A145470 A positive integer k is included if d(k) = d(k+1) + d(k+2), where d(k) is the number of divisors of k. 3
12, 30, 42, 45, 56, 66, 112, 220, 261, 282, 294, 297, 308, 342, 364, 390, 416, 477, 492, 513, 516, 532, 536, 555, 567, 572, 580, 620, 621, 632, 651, 700, 705, 768, 777, 786, 795, 812, 832, 836, 860, 880, 884, 891, 897, 906, 957, 975, 976, 981, 992, 1000, 1005 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

MATHEMATICA

Transpose[Select[Partition[Range[1010], 3, 1], DivisorSigma[0, First[#]] == DivisorSigma[0, Last[#]] + DivisorSigma[0, #[[2]]]&]][[1]] (* Amiram Eldar, Jul 17 2019 after Harvey P. Dale at A175116 *)

CROSSREFS

Cf. A000005, A145469, A175116.

Sequence in context: A334804 A328411 A333840 * A108278 A298077 A135502

Adjacent sequences:  A145467 A145468 A145469 * A145471 A145472 A145473

KEYWORD

nonn

AUTHOR

Leroy Quet, Oct 11 2008

EXTENSIONS

Extended by Ray Chandler, Oct 27 2008

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 31 12:48 EDT 2020. Contains 334748 sequences. (Running on oeis4.)