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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..30.

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

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