login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A156026 Lesser of Twin Primes of the form : p1(n)=n^1+n^2+n^3+n^4-1. 1
3, 29, 22619, 837929, 3835259, 6377549, 16007039, 30397349, 147753209, 745720139, 987082979, 2439903209, 3276517919, 4178766089, 11468884079, 58714318139, 72695416559, 418374010739, 788251653689, 829180295189 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

2+2^2=2^3+2^4-1=29;2+2^2=2^3+2^4+1=31, ... corresponding n : 1,2,12,30,44,50,63,74,110,165,177,222,239,254,327,492,519,804,942,954,...

LINKS

Table of n, a(n) for n=1..20.

MATHEMATICA

lst={}; Do[p=(n^1+n^2+n^3+n^4); If[PrimeQ[p1=p-1]&&PrimeQ[p2=p+1], AppendTo[lst, p1]], {n, 8!}]; lst

CROSSREFS

Cf. A125964, A156018, A156021

Sequence in context: A229051 A006526 A139517 * A171883 A112981 A178336

Adjacent sequences:  A156023 A156024 A156025 * A156027 A156028 A156029

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Feb 01 2009

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 20 21:03 EST 2019. Contains 329348 sequences. (Running on oeis4.)