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!)
A188488 Abundances of numbers in A188486. 2
41209, 648025, 2265025, 140351409, 41744521, 171224646849, 165946243225, 18258793926961, 494130619444401, 708164534272321, 13158483897889225, 898533377579100025, 12704639019884422009, 2193858155438587225, 2474860800395930371929, 50105354629657660921 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The square roots of the terms are 203, 805, 1505, 11847, 6461, 413793, 407365, 4273031, 22229049, 26611361, 114710435, ... - Amiram Eldar, May 17 2020

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..20

Eric Weisstein's World of Mathematics, Kravitz Conjecture

FORMULA

a(n) = A033880(A188486(n)). - Amiram Eldar, May 17 2020

CROSSREFS

Cf. A033880, A188486.

Sequence in context: A254238 A286891 A183667 * A027577 A235317 A294986

Adjacent sequences:  A188485 A188486 A188487 * A188489 A188490 A188491

KEYWORD

nonn,hard,more

AUTHOR

Eric W. Weisstein, Apr 01 2011

EXTENSIONS

a(4)-a(5) from Donovan Johnson, Apr 12 2011

a(6)-a(8) from Jack Brennen, May 03 2011

a(9)-a(11) added by Amiram Eldar, May 17 2020, from the data at A188486

Terms a(12) and beyond from Giovanni Resta, May 17 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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 21 00:14 EDT 2021. Contains 347596 sequences. (Running on oeis4.)