A354201 Inverse prime map of A354200.

1, 1, 2, 3, 7, 5, 13, 11, 19, 17, 23, 29, 37, 31, 43, 41, 47, 53, 59, 67, 61, 71, 79, 73, 89, 97, 83, 103, 101, 109, 107, 127, 113, 131, 137, 139, 149, 151, 163, 157, 167, 173, 179, 181, 193, 191, 199, 211, 223, 197, 229, 227, 233, 239, 241, 251, 257, 263, 269, 277, 271, 281, 283, 307, 293, 313, 311, 317, 331, 337

Offset

1,3

Links

Table of n, a(n) for n=1..70.

Formula

For all n >= 1, a(A000720(A354200(n))) = A000040(n).

Prog

(PARI) A354201(n) = if(n<=3, (n+1)\2, my(m=prime(n)%4); forstep(i=n-1, 0, -1, if(m==(prime(i)%4), return(prime(i)))));

Crossrefs

Cf. A000040, A000720, A354200, A354203.

Sequence in context: A359504 A064011 A050367 * A332210 A192175 A294205

Adjacent sequences: A354198 A354199 A354200 * A354202 A354203 A354204

Keyword

nonn

Author

Antti Karttunen, May 23 2022

Status

approved