A226707 Least number k such that 5^(2^i) + k is prime for i = 0,1,..,n-1.

2, 6, 6, 48, 384, 1518, 2037018, 2037018, 44279730804, 424427587626

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Example

a(5) = 384 because k = 384 is the minimal k such that  N = 5^(2^i) + k is prime for i = 0, 1, 2, 3, 4; N = 389, 409, 1009, 391009, 152587891009. But 5^(2^5) + 384 is divisible by 797 and another prime.

Crossrefs

Cf. A129613, A225560 A226281.

Sequence in context: A368393 A228955 A328584 * A097504 A356521 A189144

Adjacent sequences: A226704 A226705 A226706 * A226708 A226709 A226710

Keyword

nonn,more

Author

Robin Garcia, Jun 15 2013

Extensions

a(10) from Giovanni Resta, Jun 16 2013

Status

approved