[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.
>Sequence:
>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
>Artur
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