A365717 - OEIS

A365717

a(n) is the least k such that A003961^i(k) = A356867(1+n) for some i >= 0, where A003961^i denotes the i-th iterate of prime shift, and A356867 is Sycamore's Doudna variant D(3).

1, 2, 2, 2, 4, 6, 10, 8, 4, 2, 14, 6, 4, 20, 12, 50, 16, 18, 6, 28, 30, 8, 40, 24, 100, 32, 8, 2, 22, 10, 10, 44, 42, 70, 56, 12, 4, 98, 18, 12, 140, 60, 250, 80, 36, 18, 196, 150, 16, 200, 48, 500, 64, 54, 6, 110, 30, 20, 88, 84, 350, 112, 90, 8, 490, 54, 24, 280, 120, 1250, 160, 72, 36, 392, 300, 32, 400, 96, 1000

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..19683

FORMULA

a(n) = A348717(A356867(1+n)).

PROG

(PARI)

A348717(n) = if(1==n, 1, my(f = factor(n), k = primepi(f[1, 1])-1); for (i=1, #f~, f[i, 1] = prime(primepi(f[i, 1])-k)); factorback(f));

A365717(n) = A348717(A356867(1+n)); \\ Needs also program from A356867.

CROSSREFS