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Welcome to the OEIS wiki,
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Sequence of the Day
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A187677: Primes of the form .
221
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223
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225
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227
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229
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231
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233
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235
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219
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145
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147
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149
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151
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153
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155
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157
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217
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143
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85
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87
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89
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91
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93
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95
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215
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141
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83
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41
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43
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45
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47
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49
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213
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139
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81
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39
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13
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15
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17
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19
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211
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137
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79
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37
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11
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1
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3
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21
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209
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135
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77
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35
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9
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7
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5
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23
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In a variant of the Ulam spiral in which only odd numbers are entered, some primes still line up along some diagonals but not others. Without the even numbers, primes can also line up in horizontal and diagonal lines. This sequence comes from an upwards vertical line which starts with 13.
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OEIS lookup
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Did you know...
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On this day...
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- April 24, 1754 Edward Waring is elected a fellow at Magdalene College.
- April 24, 1899 Oscar Zariski is born in Kobrin.
- April 24, 1930 Henry Ernest Dudeney dies in Lewes.
Sequences in the News
- Aug 17 2021 Swiss scientists announce they have calculated π (A000796) to 62.8 trillion digits in only 108 days.
- Dec 25 2018 German Heise-News "integers, please" column explains A003173 and OEIS.
- Feb 01 2018 Alphabet announced a $8,589,869,056 = $A000396(6) stock buyback.
- Jan 03 2018 Largest known term of A000043 announced: 77232917.
- Nov 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.
- Sep 14 2016 Tom Greer discovers the twin primes 2996863034895 × 2 1290000 ± 1 using PrimeGrid, TwinGen and LLR.
- Jan 19 2016 Largest known term of A000043 announced: 74207281, also discovered by Curtis Cooper.
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Related web sites
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