[seqfan] Re: PUZZLE of title of A036689

N. J. A. Sloane njas at research.att.com
Sun Feb 27 14:54:28 CET 2011

I don't really understand this message, but what I do understand
I don't agree with.

I just posted a more general response to this list, saying basically
"don't change existing sequences without permission".

I undid the proposed change to A036689. It was correct.
I made a few small editorial chnages to A036689 and A117495.

Neil Sloane

>Subject: [seqfan] PUZZLE of title of A036689

>Dear Seqfans,
>I don't know that titles of sequences was changed by mistake in change 
>format on WIKI or was wrong at the begining

>A036689       Title:   Product of a prime and previous number.
>Table[Prime[n] (n - 1), {n, 1, 20}]  <- THIS IS WRONG

>{0, 3, 10, 21, 44, 65, 102, 133, 184, 261, 310, 407, 492, 559, 658, \
>795, 944, 1037, 1206, 1349}

>that is A117495
>but title is    Product of a prime number p and the number of primes 
>smaller than p.

>of course PrimePi[Prime[n]]=n
>but easier will be to say: Product of a prime and previous number. 
>(recent title of A036689)

>Best wishes

More information about the SeqFan mailing list