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

1,2

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

Prog

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

Crossrefs

Cf. A007968, A007969, A094048 (subsequence).

Sequence in context: A284532 A125585 A327236 * A109973 A340488 A339456

Adjacent sequences: A191857 A191858 A191859 * A191861 A191862 A191863

Keyword

nonn

Author

Reinhard Zumkeller, Jun 18 2011

Extensions

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

Status

approved