The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A191001 Indices k where A191620(k) = A191751(k). 1
 1, 2, 4, 5, 9, 10, 18, 26, 34, 38, 45, 50, 57, 88, 108, 115, 161, 208, 224, 225, 238, 240, 264, 354, 597, 634, 984, 1008, 1080, 1468 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA {k: A191620(k)=A191751(k)}. EXAMPLE 1 is a term because A191620(1) = A191751(1) = 0; 2 is a term because A191620(2) = A191751(2) = 1. MAPLE A191751 := proc(n) local k; for k from 0 do if isprime((2^n-1)*2^n-k) then return k: end if : end do: end proc: A191620 := proc(n) local k: for k from 0 do if isprime((2^n-k)*2^n-1) then return k: end if: end do: end proc: for n from 1 do if A191751(n) = A191620(n) then printf("%d, \n", n); end if; end do: # R. J. Mathar, Jun 25 2011 CROSSREFS Cf. A191620, A191751. Sequence in context: A086638 A319423 A265748 * A098845 A298981 A069001 Adjacent sequences:  A190998 A190999 A191000 * A191002 A191003 A191004 KEYWORD nonn,less,more AUTHOR Juri-Stepan Gerasimov, Jun 15 2011 EXTENSIONS a(25)-a(30) from Jinyuan Wang, May 15 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.

Last modified June 17 13:12 EDT 2021. Contains 345080 sequences. (Running on oeis4.)