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

3, 3, 3, 1640293473202755797

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..4.

Example

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.

Sequence in context: A343120 A230667 A131462 * A374362 A371274 A117032

Adjacent sequences: A230808 A230809 A230810 * A230812 A230813 A230814

Keyword

nonn,hard,fini

Author

Shyam Sunder Gupta, Oct 30 2013

Status

approved