login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A134651 Numbers which are the sum of two terms from A001043. 4
10, 13, 16, 17, 20, 23, 24, 26, 29, 30, 32, 35, 36, 38, 41, 42, 44, 47, 48, 50, 54, 57, 60, 64, 65, 66, 68, 70, 72, 73, 76, 78, 80, 82, 83, 84, 86, 88, 89, 90, 92, 94, 95, 96, 98, 102, 104, 105, 108, 110, 112, 114, 117, 118, 120, 124, 125, 126, 128, 130, 132, 133, 136, 138, 140 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

B. D. Swan, Table of n, a(n) for n=1,...,60000

EXAMPLE

Recall that A001043 begins with 5,8,12, ..

So 10 (5+5), 13 (5+8), 16 (8+8), 17 (5+12), 20 (8+12) are in the sequence.

PROG

(PARI) issum(i, vss) = {for (j = 1, #vss, if (vss[j] > i, break); for (k = 1, #vss, sv = vss[j] + vss[k]; if (sv == i, return (1)); if (sv > i, break); ); ); return (0); }

lista(nn) = {vec = vector(nn, i, i); vss = select(i->((precprime((i-1)/2) + nextprime(i/2) == i) && (i>2)), vec); for (i = 1, nn, if (issum(i, vss), print1(i, ", ")); ); } \\ Michel Marcus, Oct 14 2013

CROSSREFS

Cf. A001043, A134650.

Sequence in context: A247464 A219110 A226024 * A135548 A102502 A153045

Adjacent sequences:  A134648 A134649 A134650 * A134652 A134653 A134654

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jan 25 2008

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 23 14:15 EDT 2019. Contains 322386 sequences. (Running on oeis4.)