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A226708 Least number k such that 6^(2^i) + k  is prime for i = 0,1,..,n-1. 0
1, 1, 1, 11, 77, 1081, 142531, 41758027, 1206670783, 10654858617041 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 20 03:55 EDT 2019. Contains 327212 sequences. (Running on oeis4.)