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A083510 Members of A000124 which are the arithmetic mean of two other members. 0
4, 22, 29, 37, 79, 106, 154, 172, 191, 211, 254, 326, 352, 379, 466, 529, 667, 704, 904, 947, 991, 1036, 1129, 1177, 1276, 1379, 1486, 1541, 1597, 1654, 1712, 1771, 1892, 1954, 2279, 2347, 2557, 2629, 2776, 2927, 3004, 3082, 3161, 3404, 3571, 3742, 3829 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..47.

EXAMPLE

4 = (1+7)/2, 37 = (7 +67)/2. etc.

PROG

(PARI) V = vector(5000); for (i = 1, 5000, V[i] = 1 + binomial(i, 2)); count = 0; i = 1; while (count < 50, i++; found = 0; j = i - 1; k = i + 1; x = 2*V[i]; while (!found && j, if (V[j] + V[k] > x, j--, if (V[j] + V[k] < x, k++, found = 1))); if (found, count++; print(V[i]))); (Wasserman)

CROSSREFS

Cf. A000124.

Sequence in context: A204341 A036920 A036921 * A277586 A078647 A031108

Adjacent sequences:  A083507 A083508 A083509 * A083511 A083512 A083513

KEYWORD

nonn

AUTHOR

Amarnath Murthy, May 05 2003

EXTENSIONS

Corrected and extended by David Wasserman, Nov 18 2004

STATUS

approved

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Last modified July 1 22:23 EDT 2022. Contains 354984 sequences. (Running on oeis4.)