

Sequence of the Day

A008604: Multiples of .


{ 22, 44, 66, 88, 110, 132, 154, ... } 
An even number that is divisible by is obviously divisible by . (In base , a number is divisible by if and only if the sum of "digits" in base is divisible by , e.g. 1 + 10 = 11, 1 + 32 = 33, 1 + 54 = 55, ..., 2 + 14 + 94 = 110 
implies that 110, 132, 154, ..., 21494 
are divisible by .)

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On this day...

 February 22, 1805 Siméon Denis Poisson officially nominates François Arago to help him measure the meridian.
 February 22, 1930 Frank Plumpton Ramsey is born in Cambridge.
Sequences in the News
 November 18, 2016 PrimeGrid proves that 10223 is not a Sierpinski number, since 10223 × 2 31172165 + 1 is prime. So no changes to A076336 for now.
 September 14, 2016 Tom Greer discovers the twin primes 2996863034895 × 2 1290000 ± 1 using PrimeGrid, TwinGen and LLR.
 January 19, 2016 Largest known term of A000043 announced: 274207281, also discovered by Curtis Cooper.
 March 2, 2014 Fredrik Johansson announces a computation of the partition number $\scriptstyle p(10^{20})\approx 1.8381765\cdot 10^{11140086259}$, the largest known term of A000041.
 December 6, 2013 Microsoft launches a challenge to find large nonMersenne primes, A138837.
 May 13, 2013 H. A. Helfgott submits a proof of the weak Goldbach conjecture, i.e. for odd numbers as sums of three primes: A007963 has no more zeroes.
 January 25, 2013 Curtis Cooper discovers a new member of A000043, 57885161. Its index is not known but is at least 48.
 January 13, 2013 The winners of the contest for new sequences in the OEIS at JMM 2013 were announced: A187824, A187771, and A187761.

