A122459 Triangular array of sums of two odd primes.

8, 14, 12, 20, 18, 18, 26, 24, 24, 24, 34, 34, 30, 30, 30, 44, 42, 38, 40, 36, 36, 50, 48, 48, 48, 44, 46, 42, 62, 58, 54, 54, 54, 54, 50, 52, 70, 66, 66, 64, 60, 60, 60, 60, 60, 76, 76, 74, 72, 72, 70, 66, 66, 70, 68, 86, 84, 80, 82, 80, 78, 78, 76, 76, 74, 78, 100, 94, 90, 90

Offset

1,1

Links

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

Formula

T(n,k) = p(k)+p(2n+1-k) for k=1,2,...,n, where p(1)=3, p(2)=5, ... are the odd primes.

Example

First six rows:
8
14 12
20 18 18
26 24 24 24
34 34 30 30 30
44 42 38 40 36 36
Row 3 is formed from the first 6 odd primes:
3 5 7 11 13 17 --> 3+17 5+13 7+11

Crossrefs

Sequence in context: A344659 A109847 A260059 * A092537 A226799 A236295

Adjacent sequences: A122456 A122457 A122458 * A122460 A122461 A122462

Keyword

nonn,tabl

Author

Clark Kimberling, Sep 08 2006

Status

approved