The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A240435 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A240435

Catalan numbers whose sum of digits is a prime.
(history; published version)

#20 by Harvey P. Dale at Fri Jul 19 12:32:17 EDT 2019

STATUS

editing

approved

#19 by Harvey P. Dale at Fri Jul 19 12:32:15 EDT 2019

MATHEMATICA

Select[CatalanNumber[Range[100]], PrimeQ[Total[IntegerDigits[#]]]&] (* Harvey P. Dale, Jul 19 2019 *)

STATUS

approved

editing

#18 by N. J. A. Sloane at Mon Apr 14 11:20:58 EDT 2014

STATUS

editing

approved

#17 by N. J. A. Sloane at Mon Apr 14 11:20:54 EDT 2014

KEYWORD

nonn,less,base,changed

STATUS

proposed

editing

#16 by K. D. Bajpai at Fri Apr 11 22:19:05 EDT 2014

STATUS

editing

proposed

#15 by Alonso del Arte at Mon Apr 07 22:36:19 EDT 2014

KEYWORD

nonn,changed,less

STATUS

proposed

editing

#14 by Jon E. Schoenfield at Sat Apr 05 23:14:19 EDT 2014

STATUS

editing

proposed

Discussion

Sun Apr 06

00:45

K. D. Bajpai: Okey, Sir. Rewording of comments is nice.

#13 by Jon E. Schoenfield at Sat Apr 05 23:14:02 EDT 2014

COMMENTS

The 40th term a(40) in the sequence , a(40), has 651 digits.

a(41) has 1313 digits, , a(42) has 1313 digits , and a(43) has 1317 digits , which are not included in the b-file, have 1313, 1313, and 1317 digits, respectively.

STATUS

proposed

editing

Discussion

Sat Apr 05

23:14

Jon E. Schoenfield: Does this rewording of the comments look okay?

#12 by K. D. Bajpai at Sat Apr 05 15:17:14 EDT 2014

STATUS

editing

proposed

#11 by K. D. Bajpai at Sat Apr 05 15:16:02 EDT 2014

COMMENTS

The 40th term a(40) in sequence has 651 digits.

LINKS

K. D. Bajpai, <a href="/A240435/b240435.txt">Table of n, a(n) for n = 1..40</a>