The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A073566 Numbers n such that n, n+1 and n+2 have the same number of anti-divisors. 0
 19, 74, 90, 102, 148, 187, 204, 212, 213, 231, 232, 233, 328, 329, 351, 457, 469, 519, 546, 547, 555, 573, 756, 859, 868, 869, 870, 879, 980, 981, 991, 1025, 1080, 1081, 1096, 1120, 1121, 1122, 1132, 1158, 1211, 1413, 1420, 1430, 1431, 1441, 1467, 1482 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A066272 for definition of anti-divisor. LINKS Table of n, a(n) for n=1..48. MATHEMATICA at[n_] := Count[Flatten[Quotient[#, Rest[Select[Divisors[#], OddQ]]] & /@ (2 n + Range[-1, 1])], Except[1]]; Select[Range[1485], at[#] == at[# + 1] == at[# + 2] &] (* Jayanta Basu, Jul 01 2013 *) CROSSREFS Cf. A066272. Sequence in context: A047979 A290241 A159997 * A098467 A244631 A304513 Adjacent sequences: A073563 A073564 A073565 * A073567 A073568 A073569 KEYWORD nonn AUTHOR Jason Earls, Aug 31 2002 STATUS approved

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

Last modified December 9 12:31 EST 2023. Contains 367690 sequences. (Running on oeis4.)