A066162 Let p be a prime of the form 4k-1; sequence gives (q!^2-1)/p where q = (p-1)/2.

0, 5, 1309, 6930626021, 69276127053913, 55161685571748368516129, 60704287720766467657420739188688372093, 14219718499310404733294067750922248714893617, 1325029748371862191613733461029305453409268582295864406779661

Offset

1,2

Links

Table of n, a(n) for n=1..9.

Ed Pegg, Jr., Math. Puzzles

Formula

a(n) = (q!^2-1)/p where q=(p-1)/2 and p = A002145(n). - Sean A. Irvine, Oct 02 2023

Crossrefs

Cf. A002145.

Sequence in context: A069642 A182345 A268485 * A096725 A332536 A172920

Adjacent sequences: A066159 A066160 A066161 * A066163 A066164 A066165

Keyword

nonn

Author

N. J. A. Sloane, Dec 13 2001

Extensions

Missing a(1)=0 inserted by Sean A. Irvine, Oct 02 2023

Status

approved