A230488 Pseudoprimes n to base 2 such that n-2 and n-4 are primes.

645, 33153, 129921, 157641, 451905, 656601, 1608465, 3020361, 3370641, 6212361, 19092921, 34487601, 38790753, 681942801, 940492785, 1109260545, 1574300001, 2693081973, 3037396461, 4160578521, 6424683105, 7384487181, 13671360561, 14966031345, 15731001105

Offset: 1

Author

Shyam Sunder Gupta, Oct 20 2013

Keywords

• nonn

Examples

			645 is a pseudoprime (base 2) and 643 and 641 are primes.
		

Links

• Shyam Sunder Gupta, Table of n, a(n) for n = 1..7173

Crossrefs

Cf. A001567, A057942.