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A282974 Numbers n such that A011546(n) is a prime. 1
1, 2, 6, 12, 1902, 3971, 5827 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Round(k)=floor(k) or floor(k)+1, so if round(k)=floor(k) and floor(k) is a prime number, then round(k) is also prime. Thus 47577 = A005042(6) and 613373 = A005042(8) are also terms.

The corresponding primes are in A282973.

LINKS

Table of n, a(n) for n=1..7.

Eric Weisstein's World of Mathematics, Pi-Prime

MATHEMATICA

Do[If[PrimeQ[Round[Pi*10^(n-1)]], Print[n], {n, 17511}]

CROSSREFS

Cf. A000796, A005042, A011546, A282973.

Sequence in context: A126293 A007668 A089415 * A181063 A161324 A226603

Adjacent sequences:  A282971 A282972 A282973 * A282975 A282976 A282977

KEYWORD

nonn,base,more

AUTHOR

XU Pingya, Feb 25 2017

STATUS

approved

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Last modified February 25 03:06 EST 2018. Contains 299630 sequences. (Running on oeis4.)