OFFSET
1,1
COMMENTS
The "warp" operation is reversible between A323782 and this sequence.
Negating a number in balanced ternary notation is done by inverting the + and -.
LINKS
EXAMPLE
-17 is a term:
-17 is -+0+ in balanced ternary notation
-+0+ reversed is +0+-
+0+- is 29 in balanced ternary notation
29 is prime
Therefore -17 is "warped" to 29.
This operation is reversible: 29 "warps" to -17.
PROG
(Python) See links
(PARI) d3(n) = if ((n%3)==2, n\3+1, n\3);
m3(n) = if ((n%3)==2, -1, n % 3);
t(n) = if (n==0, [0], if (abs(n) == 1, [n], concat(m3(n), t(d3(n)))));
f(n) = subst(Pol(Vec(t(n))), x, 3);
lista(nn) = {forprime(n=1, nn, if (isprime(abs(f(n))), print1(f(n), ", ")); ); } \\ Michel Marcus, Jan 29 2019
CROSSREFS
KEYWORD
sign,base
AUTHOR
Philippe Cochin, Jan 27 2019
STATUS
approved