A085809 Indices of semiprimes where largest gap occurs. Or, positions of records in A065516.

1, 2, 4, 6, 10, 34, 186, 422, 760, 1765, 4112, 4585, 8112, 8650, 8861, 75150, 223993, 327048, 712605, 1135940, 23958638, 42367759, 47848742, 54626559, 121984495, 157877985, 413509327, 798321315, 983679985, 1277946119, 2403158480

Offset

1,2

Comments

A215231(n) = A065516(a(n)). - Reinhard Zumkeller, Mar 23 2014

Links

Table of n, a(n) for n=1..31.

Prog

(PARI) {sgr(m)=local(a, b, rec, c); c=0; a=0; b=4; rec=0; for(n=5, m, if(bigomega(n)==2, c++; a=n; if(a-b>rec, rec=a-b; print1(c", "); b=a, b=a; )))}
(Haskell)
a085809 n = a085809_list !! (n-1)
-- See A215231 for definition of a085809_list.
-- Reinhard Zumkeller, Mar 23 2014

Crossrefs

Cf. A239674.

Sequence in context: A005194 A171447 A207667 * A073308 A058960 A036053

Adjacent sequences: A085806 A085807 A085808 * A085810 A085811 A085812

Keyword

nonn

Author

Jason Earls, Jul 24 2003

Extensions

a(19)-a(26) from Donovan Johnson, Jan 28 2009

a(27)-a(31) from Donovan Johnson, Apr 14 2010

Status

approved