A226708 Least number k such that 6^(2^i) + k is prime for i = 0,1,..,n-1.

1, 1, 1, 11, 77, 1081, 142531, 41758027, 1206670783, 10654858617041

Offset

1,4

Comments

a(5) = 77 because k = 77 is the minimal k such that N = 6^(2^i) + k is prime for i = 0, 1, 2, 3, 4; N = 83, 113, 1373, 1679693, 2821109907533. But 6^(2^5) + 77 is divisible by 79 and another prime.

Links

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

Crossrefs

Cf. A129613, A225560, A226281, A226707.

Sequence in context: A000589 A211830 A322877 * A206529 A118936 A041224

Adjacent sequences: A226705 A226706 A226707 * A226709 A226710 A226711

Keyword

nonn,more

Author

Robin Garcia, Jun 15 2013

Extensions

a(10) from Giovanni Resta, Jun 16 2013

Status

approved