A108702 Triangle read by rows where n-th row contains the smallest n primes of form 4k+3 if n is odd and of form 4k+1 if n is even such that sequence is always increasing.

3, 5, 13, 19, 23, 31, 37, 41, 53, 61, 67, 71, 79, 83, 103, 109, 113, 137, 149, 157, 173, 179, 191, 199, 211, 223, 227, 239, 241, 257, 269, 277, 281, 293, 313, 317, 331, 347, 359, 367, 379, 383, 419, 431, 439, 449, 457, 461, 509, 521, 541, 557, 569, 577, 593

Offset

1,1

Links

Table of n, a(n) for n=1..55.

Example

Triangle begins:
1: 3
2: 5,13
3: 19,23,31
4: 37,41,53,61
5: 67,71,79,83,103

Crossrefs

Cf. A109416-A109420.

Sequence in context: A180120 A075704 A045413 * A136053 A157468 A191017

Adjacent sequences: A108699 A108700 A108701 * A108703 A108704 A108705

Keyword

easy,nonn,tabl

Author

Giovanni Teofilatto, Jun 20 2005

Extensions

Edited and extended by Ray Chandler, Jun 27 2005

Status

approved