A230811 Smallest starting number for n consecutive odd numbers that are primes or strong pseudoprime (base 2).

3, 3, 3, 1640293473202755797

Offset: 1

Author

Shyam Sunder Gupta, Oct 30 2013

Keywords

• nonn
• hard
• fini

Comments

It is conjectured that there can be at most one more term, a(5).

Examples

			First and smallest occurrence of n, n >= 1, consecutive odd numbers that are primes or strong pseudoprime (base 2):
a(1) = 3: (3) ;
a(2) = 3: (3, 5) ;
a(3) = 3: (3, 5, 7);
a(4) = 1640293473202755797: (1640293473202755797, 1640293473202755799, 1640293473202755801, 1640293473202755803); (1640293473202755801 is strong pseudoprime base 2 and others are prime);
		

Crossrefs

Cf. A001567, A001262, A230667, A230810.