The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons 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 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A339550 Numbers k such that A339549(k) = A339549(k+1). 2
 1, 9, 85, 697, 1285, 2605, 4573, 5845, 6001, 6241, 6613, 7141, 7453, 8005, 10897, 12453, 13141, 15445, 19789, 20345, 21445, 21913, 22873, 25957, 36565, 36601, 39597, 44761, 46405, 53677, 56137, 56593, 61013, 63445, 70094, 72913, 76977, 80913, 82405, 87085, 87601 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Analogous to A338452 as A339549 is analogous to A093653. LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 EXAMPLE 9 is a term since A339549(9) = A339549(10) = 4. MATHEMATICA f[n_] := Times @@ (DigitCount[#, 2, 1] & /@ Divisors[n]); Select[Range[10000], f[#] == f[# + 1] &] CROSSREFS Cf. A000120, A093653, A338452, A339549. Sequence in context: A196434 A197197 A295118 * A228417 A015580 A163308 Adjacent sequences:  A339547 A339548 A339549 * A339551 A339552 A339553 KEYWORD nonn,base AUTHOR Amiram Eldar, Dec 08 2020 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.

Last modified December 2 10:13 EST 2021. Contains 349437 sequences. (Running on oeis4.)