A058361 a(n) is the least k in A002977 with a gap of n. Also n + a(n) is the least k in A007448 which is repeated n times.

3, 1, 4, 15, 22, 121, 735, 31, 46, 22143, 4468, 67, 31455, 391, 2308, 447, 94, 33151, 16383, 139, 202, 7551, 5224, 787, 1595391, 3685, 580, 30591, 418, 42495, 1791, 607, 1342, 3217407, 1095166, 283, 398847, 32767, 365311, 88575, 1174, 6925, 12304383

Offset: 1

Author

Robert G. Wilson v, Dec 16 2000

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..84

Crossrefs

Cf. A002977, A007448.

Programs

Mathematica

k = {1}; Do[ k = Union[ Join[ k, 2k + 1, 3k + 1 ] ]; l = Length[ k ]; i = 1; While[ i < l && k[ [ i ] ] < 10^9, i++ ]; k = Take[ k, {1, i} ], {n, 1, 30} ]; f[ n_Integer ] := (i = 1; While[ k[ [ i + 1 ] ] - k[ [ i ] ] != n, i++ ]; k[ [ i ] ]); Table[ f[ n ], {n, 1, 84} ]