The great Roger Penrose is approaching his 90th
birthday. He was asked
recently if he was looking forward to this and he
replied saying that he
was not and that he thought his 89th birthday had
been a far more
significant milestone as it is a Fibonacci number,
and was likely to be
the
last Fibonacci number he would reach in his
lifetime.

He's
right - we should take note of these and have a bit
of extra celebration
on our 1st, 2nd, 3rd, 5th, 8th, 13th, 21st, 34th,
55th and 89th
birthdays. We should also mark our 6th (perfect and
factorial number),
24th (factorial) and 28th (perfect) birthdays. It
might be overdoing it
to also mark triangular numbers, squares and cubes
unless you're really
keen on special birthdays. This represents a whole
new opportunity for
the greetings card industry, who will have to find a
rhyme for
'Fibonacci'.

[kdf] - you're right - the trite poem for someone's
89th birthday card could therefore read:

"Happy Birthday, it's your twelfth Fibonacci,
That means you're nearly as old as Liberace!"

[xenzag] That might be too much - but how about a
special birthday to mark 31 years and 259 days (and
about 1 and three-quarter hours)? - that's a billion
seconds since your birth.

If it's possible to have Unbirthdays - and it clearly is a thing, so yes - then it must be possible to also have imaginary birthdays, though these are probably limited to scientists, engineers and mathematicians ...

There was a young man from Karachi Who dressed
himself up in Versace When they asked him
why He'd pose, and would cry: "Because it's my
ninth Fibonacci*!"

I would have brought gifts monetary,
But money does not grow on a tree.
No longer your age has identity
Was easy when you were two, one, or three
But after two years of maturity,
Yes, now it's your fourth Fibonacci

I just thought of a small problem: both the 1st AND 2nd
Fibonacci numbers are "1". So, do you celebrate twice, or
just get twice as many gifts in the one celebration (or do
you not care, because you're only 1 year old)?

I think the first number is actually 0 (so the series
goes 0, 1, 1, 2, 3, 5, 8, 13, 21) but I take your
point. I think you’d have to have two simultaneous
celebrations on your first birthday

So... you people start rhyming Fibonacci, and you take all the good ones, and so I'm stuck with Friggin Nazi, and i can't fit it into a poem without looking like an asshole, and I shouldn't have even said anything, and I hope you're all happy now.

//In a year and some change I will have been on this
site 20 years.// - newbie!

A youngish Italian-Apache Looked sad as he
cried
"Mi dispiace!" "I've forgotten your birthday"
"I do hope it's OK" "'cos I know it's your
sixth Fibonacci!"

Yes, you’re right. Eight or nine syllables are
allowed for lines 1, 2 and 5 of a limerick but as I
chose nine syllables for lines 1 and 2, I should have
stuck with that for line 5. It does kind of work if
you emphasise the word “But”.

Thanks for helping make sense of birthdays. They are far
more deserving of recognition than other momentous days
like, say, Halloween -- which no one really explains well.

No, I meant "there" referring to the USA - i.e. are
limericks a familiar form of nonsense poetry in the
USA? I think probably not, judging by your answer...