A207975 Triangle where row n consists of a sequence of n positive integers g(1) < g(2) < ... < g(n) with the minimal sum such that A001222(g(i)+g(j)) = A001222(g(i)) + A001222(g(j)) for all 1 <= i < j <= n.

1, 1, 2, 2, 6, 10, 3, 9, 19, 43, 5, 15, 29, 39, 53, 5, 15, 29, 39, 53, 173, 5, 39, 53, 111, 173, 237, 293, 7, 35, 67, 151, 211, 215, 547, 607, 5, 29, 113, 269, 353, 449, 509, 634, 1613, 41, 99, 201, 521, 597, 761, 921, 1193, 1361, 1761, 41, 257, 461, 941, 1637, 2957, 3269, 3821, 4126, 4157, 4637

Offset

1,3

Links

Table of n, a(n) for n=1..66.

Example

The triangle starts with:
n=1: 1
n=2: 1, 2
n=3: 2, 6, 10
n=4: 3, 9, 19, 43
n=5: 5, 15, 29, 39, 53
n=6: 5, 15, 29, 39, 53, 173
n=7: 5, 39, 53, 111, 173, 237, 293
n=8: 7, 35, 67, 151, 211, 215, 547, 607
n=9: 5, 29, 113, 269, 353, 449, 509, 634, 1613
...

Crossrefs

Row sums are given by A059393.

Cf. A059363.

Sequence in context: A034805 A192659 A327485 * A321623 A077063 A081728

Adjacent sequences: A207972 A207973 A207974 * A207976 A207977 A207978

Keyword

nonn,tabl

Author

Max Alekseyev, Feb 22 2012

Extensions

More terms from Sean A. Irvine, Sep 21 2022

Status

approved