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!)
A193801 Semiprimes in Gica-Panaitopol recursion A193298. 0
4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39, 46, 49, 51, 55, 57, 58, 69, 74, 77, 82, 85, 86, 87, 91, 106, 111, 115, 118, 119, 121, 122, 123, 129, 133, 134, 158, 159, 161, 166, 169, 177, 178, 183, 185, 187, 194, 201, 202, 203, 205, 206, 237, 247 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Gica-Panaitopol semiprimes. Numbers of the form p*q where p and q are primes, not necessarily distinct, in Gica-Panaitopol recursion: g(1) = 1; g(n+1) = 2*g(n) if g(n) <= n; otherwise g(n+1) = g(n) - 1.

LINKS

Table of n, a(n) for n=1..58.

FORMULA

A001358 INTERSECTION A193298.

CROSSREFS

Cf. A001358, A193298, A193299.

Sequence in context: A001358 A176540 A108764 * A129336 A226526 A103607

Adjacent sequences:  A193798 A193799 A193800 * A193802 A193803 A193804

KEYWORD

nonn,easy

AUTHOR

Jonathan Vos Post, Aug 05 2011

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 25 10:57 EDT 2020. Contains 334592 sequences. (Running on oeis4.)