login
A352707
Array read by ascending antidiagonals T(n,k) = abs(prime(n)-nonprime(k)).
1
1, 2, 2, 4, 1, 4, 6, 1, 3, 6, 10, 3, 1, 5, 7, 12, 7, 1, 3, 6, 8, 16, 9, 5, 1, 4, 7, 10, 18, 13, 7, 3, 2, 5, 9, 12, 22, 15, 11, 5, 2, 3, 7, 11, 13, 28, 19, 13, 9, 4, 1, 5, 9, 12, 14, 30, 25, 17, 11, 8, 3, 1, 7, 10, 13, 16, 36, 27, 23, 15, 10, 7, 1, 3, 8, 11, 15, 18
OFFSET
1,2
FORMULA
T(n,1) = A006093(n).
EXAMPLE
First few rows of array:
1 2 4 6 7 8 10
2 1 3 5 6 7 9
4 1 1 3 4 5 7
6 3 1 1 2 3 5
10 7 5 3 2 1 1
12 9 7 5 4 3 1
16 13 11 9 8 7 5
PROG
(PARI) nonprime(n) = my(a=1, b=n); while(a!=b, a=b; b=n+primepi(a)); b; \\ A018252
T(n, k) = abs(prime(n)-nonprime(k));
CROSSREFS
Cf. A000040 (primes), A018252 (nonprimes), A006093.
Sequence in context: A023137 A327488 A065273 * A140819 A138558 A111580
KEYWORD
nonn,tabl
AUTHOR
Michel Marcus, Apr 19 2022
STATUS
approved