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

1,1

Comments

Subsequence of A071837.

Links

Chai Wah Wu, Table of n, a(n) for n = 1..86

Formula

a(n) = 2^p*p^2, with p=A001359(n).

a(n) = A007758(A001359(n)). - Michel Marcus, Aug 21 2014

Example

a(1)=2^3*3^2=72=A071837(3), a(4)=2^17*17^2=37879808=A071837(10).

Prog

(PARI) forprime(p=3, 100, isprime(2+p) && print1(p", "))
(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

Crossrefs

Cf. A001359, A071837.

Sequence in context: A113855 A082949 A330829 * A210627 A019562 A250423

Adjacent sequences: A240980 A240981 A240982 * A240984 A240985 A240986

Keyword

nonn

Author

Zak Seidov, Aug 21 2014

Extensions

More terms from Chai Wah Wu, Aug 27 2014

Status

approved