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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
OFFSET
1,2
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
Sequence in context: A086638 A319423 A265748 * A098845 A298981 A069001
KEYWORD
nonn,less,more
AUTHOR
EXTENSIONS
a(25)-a(30) from Jinyuan Wang, May 15 2020
STATUS
approved