OFFSET
1,1
COMMENTS
For n > 48, a(n) = a(n-48) + 11184810; the first 48 values are in the data.
The set {3, 5, 7, 13, 17, 241} is the set of prime divisors of 2^24 - 1. Hence for every p in the set the multiplicative order of 2 modulo p divides 24. Note that twice the product of {3, 5, 7, 13, 17, 241} is 11184810. - Jeppe Stig Nielsen, Mar 10 2019
Subset of provable Sierpiński numbers A076336. - Jeppe Stig Nielsen, Mar 10 2019
FORMULA
For n > 48, a(n) = a(n-48) + 11184810.
PROG
(PARI) D=[3, 5, 7, 13, 17, 241]; P=2*lcm(D); M=lcm(apply(d->znorder(Mod(2, d)), D)); forstep(k=1, +oo, 2, if(k%P==1, print(); print()); for(n=0, M-1, for(i=1, #D, k*Mod(2, D[i])^n+1==0 && next(2)); next(2)); print1(k, ", ")) \\ Jeppe Stig Nielsen, Mar 10 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Pierre CAMI, Jun 30 2014
STATUS
approved