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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A021007 Let q_k=p(p+2) be product of k-th pair of twin primes; sequence gives values of p+2 such that (q_k)^2 > q_{k-i}q_{k+i} for all 1 <= i <= k-1. 1
13, 31, 61, 103, 139, 181, 193, 229, 421, 523, 571, 601, 811, 823, 1021, 1231, 1279, 1291, 1609, 1669, 1873, 2083 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

EXAMPLE

E.g. (11*13)^2 > (5*7)*(17*19): (11*13)^2 > (3*5)*(29*31)

CROSSREFS

Cf. A028388, A021005.

Sequence in context: A166143 A065768 A155820 * A061239 A072023 A158723

Adjacent sequences:  A021004 A021005 A021006 * A021008 A021009 A021010

KEYWORD

easy,nonn

AUTHOR

Naohiro Nomoto (6284968128(AT)geocities.co.jp)

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 20:54 EST 2012. Contains 205966 sequences.