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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A359447 a(n) is the least number that is the sum of two cubes of primes and is 2^n times an odd prime, or -1 if there is no such number.

Table of values

n a(n)
1 -1
2 -1
3 152
4 2224
5 9056
6 108736
7 -1
8 4532992
9 34674176
10 268684288
11 2280249344
12 18693763072
13 138890141696
14 1111848828928
15 8803419521024
16 70375767212032
17 564861779443712
18 4507018424221696
19 36030079546425344
20 288238419152207872
21 2305850719072157696
22 18446757709572210688
23 147573952867129622528

List of values

[-1, -1, 152, 2224, 9056, 108736, -1, 4532992, 34674176, 268684288, 2280249344, 18693763072, 138890141696, 1111848828928, 8803419521024, 70375767212032, 564861779443712, 4507018424221696, 36030079546425344, 288238419152207872, 2305850719072157696, 18446757709572210688, 147573952867129622528]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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