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A123340 Least m such that 2^n+3^m is prime. 3
0, 0, 0, 1, 0, 2, 1, 1, 0, 2, 2, 4, 1, 3, 3, 1, 0, 8, 1, 4, 8, 8, 6, 2, 7, 27, 6, 13, 1, 10, 1, 6, 4, 8, 18, 9, 19, 2, 15, 29, 3, 3, 17, 10, 3, 11, 6, 2, 5, 20, 34, 4, 12, 10, 26, 1, 4, 2, 9, 29, 29, 10, 34, 13, 4, 8, 2, 1, 8, 10, 26, 50, 19, 12, 10, 8, 13, 27, 17, 9, 33, 4, 2, 17, 1, 7, 3, 5, 61, 26 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Table of n, a(n) for n=0..89.

EXAMPLE

a(0)=0 because 2^0+3^0=1+1=2 is prime,

a(3)=1 because 2^3+3^1=8+3=11 is prime,

a(17)=8 because 2^17+3^8=131072+6561=137633 is prime,

a(25)=27 because 33554432+7625597484987=7625631039419 is prime, etc.

CROSSREFS

Sequence in context: A331410 A336928 A114638 * A267486 A285229 A227425

Adjacent sequences:  A123337 A123338 A123339 * A123341 A123342 A123343

KEYWORD

nonn

AUTHOR

Zak Seidov, Oct 11 2006

STATUS

approved

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Last modified September 23 02:41 EDT 2021. Contains 347609 sequences. (Running on oeis4.)