This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A111658 Pronic residues. These are analogous to quadratic residues, but use the set of pronics 0 2 6 12 20 30... instead of the quadratics (squares) 0 1 4 9 16 25... The example shown above is mod 13. 0
 0, 2, 6, 12, 7, 4, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS It is noted that when the modulus is not prime that a 0 may appear in the interior of the sequence. example for mod (15). 0 2 6 12 5 0 12 11. LINKS FORMULA Prn(i) -= r(i) mod (z) where Prn(i) is the i-th pronic, -= is the congruence sign, r(i) is the i-th residue and mod (z) is the modulus used. EXAMPLE r(5) = 7 mod (13). CROSSREFS Sequence in context: A014965 A074259 A113540 * A105692 A107647 A210842 Adjacent sequences:  A111655 A111656 A111657 * A111659 A111660 A111661 KEYWORD easy,nonn AUTHOR Stuart M. Ellerstein (ellerstein(AT)aol.com), Nov 17 2005 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 7 03:27 EST 2019. Contains 329836 sequences. (Running on oeis4.)