A240983 Integers of the form 2^p*p^2 where p is the lesser of a pair of twin primes.
72, 800, 247808, 37879808, 451508436992, 3696558092582912, 2006659878768217161728, 11902724720072940761120768, 25862607545856336249335738796081152, 1857706460417663797470176639788777472, 3270020989306416138620967939526071071138643968
Offset: 1
Keywords
Examples
a(1)=2^3*3^2=72=A071837(3), a(4)=2^17*17^2=37879808=A071837(10).
Links
- Chai Wah Wu, Table of n, a(n) for n = 1..86
Programs
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PARI
forprime(p=3,100,isprime(2+p) && print1(p","))
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Python
from sympy import prime, isprime A240983 = [2**p*p*p for p in (prime(n) for n in range(1,2*10**3)) if isprime(p+2)] # Chai Wah Wu, Aug 27 2014
Formula
a(n) = 2^p*p^2, with p=A001359(n).
Extensions
More terms from Chai Wah Wu, Aug 27 2014
Comments