A228575 Pseudoprimes n to base 2 such that n-4, n-2 and n+2 are primes.

645, 656601, 6212361, 18958567881, 287468425245, 626160901281, 1395494019921, 1925525109201, 1960708164801, 1962378065901, 1977370759365, 2788325761551, 3032013857181, 6877227801081, 22298617759881, 30242009317521, 39454593651201, 42401101442001

Offset: 1

Author

Shyam Sunder Gupta, Oct 27 2013

Keywords

• nonn

Comments

All numbers in this sequence end in either 5 or 1.

Examples

			645 is a pseudoprime (base 2) and 641, 643 and 647 are primes.
		

Links

• Shyam Sunder Gupta, Table of n, a(n) for n = 1..831

Crossrefs

Cf. A001567, A057942, A230488, A230489.