A243106 -id:A243106 - cp's OEIS frontend

2, -2, -10, 6, -26, 38, -90, 166, 678, 1702, -346, 3750, -4442, 11942, 44710, 110246, -20826, 241318, -282970, 765606, 2862758, 7057062, -1331546, 15445670, 49000102, 116108966, 250326694, 518762150, -18108762, 1055633062

Offset: 1

M. F. Hasler, Aug 20 2014

sign

Inspired by A243106. In contrast to that sequence, the absolute values are not increasing here.

This can be explained as follows: By comparison of the absolute values among both sequences, after replacing for each term at the other sequence: 8,9 with 0,1 it is obtained the a(n) corresponding here expressed in binary with one or more "leading zeros". This induces the described effect, cf. example. - R. J. Cano, Aug 20 2014

			From _R. J. Cano_, Aug 20 2014: (Start)
By looking at A243106's b-file for n=28..30:
28 11110911090911090911090908910
29 -88889088909088909088909091090
30 911110911090911090911090908910
After taking the absolute values, making the replacements, and deleting the leading zeros, we obtain:
28 11110111010111010111010100110
29 1000101000101000101011010 (4 leading zeros deleted)
30 111110111010111010111010100110
From where it is noticeable that abs(a(28))>abs(a(29))<abs(a(30)); Now by reading from binary:
abs(a(28))=518762150
abs(a(29))=18108762 (it was negative)
abs(a(30))=1055633062 (End)

Jens Kruse Andersen, Table of n, a(n) for n = 1..1000

PARI
```
a(n,b=2)=sum(k=1,n,(-1)^isprime(k)*b^k)
```

cp's OEIS Frontend

A242002 Sum_{k=1..n} (-1)^isprime(k)*2^k.

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