A070213 Numbers k such that A056542(k) is prime.

4, 8, 18, 20, 70

Offset

1,1

Comments

The 6th term (if it exists) is larger than 1019.

No additional primes for n < 14000. - T. D. Noe, Jul 07 2005

Links

Table of n, a(n) for n=1..5.

Tom Mueller, Prime and Composite Terms in Sloane's Sequence A056542, Journal of Integer Sequences, Vol. 8 (2005), Article 05.3.3.

Crossrefs

Cf. A056542.

Sequence in context: A174741 A312827 A308150 * A077474 A307817 A210433

Adjacent sequences: A070210 A070211 A070212 * A070214 A070215 A070216

Keyword

hard,nonn

Author

Tom Mueller (muel4503(AT)uni-trier.de), May 07 2002

Extensions

a(5) from Tom Mueller (muel4503(AT)uni-trier.de), Oct 30 2004

Name clarified by Sean A. Irvine, Jun 02 2024

Status

approved