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A122459 Triangular array of sums of two odd primes. 1
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 (list; table; graph; refs; listen; history; text; internal format)
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: A220393 A109847 A260059 * A092537 A226799 A236295

Adjacent sequences:  A122456 A122457 A122458 * A122460 A122461 A122462

KEYWORD

nonn,tabl

AUTHOR

Clark Kimberling, Sep 08 2006

STATUS

approved

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Last modified January 25 08:01 EST 2021. Contains 340416 sequences. (Running on oeis4.)