Numbers 1370-1399

A page of the Numeropedia - the Special Encyclopedia of Numbers

1000-1099    1100-1199    1200-1299   1300-1399   1400-1499

 1500-1599   1600-1699   1700-1799    1800-1899   1900-1999

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Back to [Numbers 1300-1399]

 

1,370

[Math.]  1,370 = 12+372+02 = 13+372+01 = 11+372+01.

 

1,371

[Math.]  1,371 = 12+372+12 = 13+372+11 = 11+372+11.

 

1,373

[Math.]  A prime number.

 

1,378

[Math.]  A triangular number (sum of all integers from 1 to 52): 1378 = 1+2+…+51+52.

  

1,381

[Math.]  A prime number.

 

1,385

[Math.]  Euler numbers (or secant numbers Ei) are defined by the infinite series: sec(x) = 1/cos(x) = 1+E2(x2/2!)+E4(x4/4!)+E6(x6/6!)+…, where E0 = 1, E2 = –1, E4 = 5, E6 =  –61, E8 = 1,385, E10 = –50,521, E12 = 2,702,765, E14 = –199,360,981, E16 = 19,391,512,145, E18 = –2,404,879,675,441… The odd-indexed Euler numbers are all 0. The even-indexed Euler numbers have alternating signs.

 

1,399

[Math.]  A prime number.

 

1,330-1,349 (separate page)    


1,350-1,369 (separate page)    

 

1,370-1,399 (separate page)