A087349 n + (smallest prime-factor of n+1).

3, 5, 5, 9, 7, 13, 9, 11, 11, 21, 13, 25, 15, 17, 17, 33, 19, 37, 21, 23, 23, 45, 25, 29, 27, 29, 29, 57, 31, 61, 33, 35, 35, 39, 37, 73, 39, 41, 41, 81, 43, 85, 45, 47, 47, 93, 49, 55, 51, 53, 53, 105, 55, 59, 57, 59, 59, 117, 61, 121, 63, 65, 65, 69, 67, 133, 69, 71, 71

Offset

1,1

Comments

a(n) = n + A020639(n+1).

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Prog

(Haskell)
a087349 n = a020639 (n + 1) + n  -- Reinhard Zumkeller, Mar 31 2014

Crossrefs

A061228(n) - 1.

Sequence in context: A229428 A348374 A029639 * A212631 A090792 A076877

Adjacent sequences: A087346 A087347 A087348 * A087350 A087351 A087352

Keyword

nonn

Author

Reinhard Zumkeller, Oct 20 2003

Status

approved