A191860 First member of a pair of numbers occurring in the definition of 1-happy couples.

1, 2, 2, 3, 3, 1, 18, 4, 4, 13, 1, 3, 5, 5, 3, 70, 1, 1, 6, 6, 3, 3, 32, 59, 3, 4, 7, 7, 9, 182, 11, 2, 1, 5, 23, 1, 29718, 8, 8, 221, 2, 13, 7, 1, 1068, 1, 39, 5, 9, 9, 3, 378, 7, 500, 11, 5, 45, 151, 1, 5604, 10, 10, 5, 2, 31, 5, 8890182, 1, 7, 3, 776, 15

Offset: 1

Author

Reinhard Zumkeller, Jun 18 2011

Keywords

• nonn

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..200
• J. H. Conway, On Happy Factorizations, J. Integer Sequences, Vol. 1, 1998, #1.
• Initial Happy Factorization Data

Crossrefs

Cf. A007968, A007969, A094048 (subsequence).

Programs

Haskell

a191860 = fst . sqrtPair . a007969
Function sqrtPair is defined in A007968.
-- Reinhard Zumkeller, Oct 11 2015

Extensions

Wrong comment and wrong formula removed (thanks to Wolfdieter Lang, who pointed this out) by Reinhard Zumkeller, Oct 11 2015