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A131937 a(1)=1; a(2)=4. a(n) = a(n-1) + (n-th positive integer which does not occur in sequence A131938). 4
1, 4, 8, 14, 21, 29, 38, 49, 61, 74, 88, 103, 120, 138, 157, 177, 198, 220, 244, 269, 295, 322, 350, 379, 409, 440, 473, 507, 542, 578, 615, 653, 692, 732, 773, 816, 860, 905, 951, 998, 1046, 1095, 1145, 1196, 1248, 1302, 1357, 1413, 1470, 1528, 1587, 1647 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..52.

EXAMPLE

A131938: 2,5,10,16,23,32,42,53,...

Positive integers not in A131938: 1,3,4,6,7,8,9,11,...

So A131937(8) = A131937(7) + 11 = 49.

CROSSREFS

Cf. A131938.

Sequence in context: A312697 A312698 A312699 * A183857 A088804 A344012

Adjacent sequences:  A131934 A131935 A131936 * A131938 A131939 A131940

KEYWORD

nonn

AUTHOR

Leroy Quet, Jul 30 2007

EXTENSIONS

More terms from Farideh Firoozbakht, Aug 07 2007

a(51)-a(52) from Ray Chandler, Mar 06 2010

STATUS

approved

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Last modified September 26 13:21 EDT 2021. Contains 347668 sequences. (Running on oeis4.)