A083401 Numbers k such that A073605(k) is prime.

3, 4, 5, 6, 15, 21, 25, 27, 28, 52, 70, 205, 245, 308, 339, 357, 415, 524, 537, 1455, 1500

Offset

1,1

Comments

No other terms below 2200. [Max Alekseyev, May 11 2009]

Links

Table of n, a(n) for n=1..21.

Example

a(1)=3 because A073605(3)=7 is prime and A073605(1) and A073605(2) aren't primes.

Mathematica

For[k = 0, k < 875, If[PrimeQ[ChineseRemainder[ -Range[k], Prime[Range[k]]]], Print[k]], k++ ]

Crossrefs

Cf. A053664, A073605, A053664.

Sequence in context: A351711 A294247 A346310 * A281829 A083400 A154665

Adjacent sequences: A083398 A083399 A083400 * A083402 A083403 A083404

Keyword

nonn,more

Author

Farideh Firoozbakht, Jun 07 2003

Extensions

a(20)-a(21) from Max Alekseyev, May 11 2009

Status

approved