This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A139248 Triangle read by rows: row n lists the proper divisors of n-th even superperfect number A061652(n). 1
 1, 1, 2, 1, 2, 4, 8, 1, 2, 4, 8, 16, 32, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 1, 2, 4, 8, 16 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Also, row n list the proper divisors of n-th superperfect number A019279(n), if there are no odd superperfect numbers. Row n has (A000043(n) - 1) = A090748(n)) terms. LINKS EXAMPLE Triangle begins: 1 1, 2 1, 2, 4, 8 1, 2, 4, 8, 16, 32 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048 CROSSREFS Cf. A000043, A000668, A018254, A018487, A019279, A061652, A090748, A133024, A133025, A133031, A133049, A135652, A135653, A135654, A135655, A139246. Sequence in context: A136102 A279586 A275762 * A138380 A016013 A193384 Adjacent sequences:  A139245 A139246 A139247 * A139249 A139250 A139251 KEYWORD nonn,tabf AUTHOR Omar E. Pol, Apr 22 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 22 09:57 EDT 2018. Contains 316433 sequences. (Running on oeis4.)