A377926 Indices of records in A228407.

0, 1, 4, 8, 13, 15, 22, 28, 29, 30, 31, 62, 78, 94, 108, 138, 169, 205, 238, 279, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 419, 519, 611, 667, 884, 3341, 3415, 3839, 4623, 4665, 5974, 5975, 5976, 5977, 5978, 5979, 5980, 5981, 5982, 5983, 5984, 5985, 5986, 5987, 5988, 5989, 5990, 5991, 5992, 5993, 5994, 5995, 5996, 5997, 5998

Offset: 1

Author

N. J. A. Sloane, Dec 14 2024

Keywords

• nonn
• base

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..10000 (terms 1..514 from N. J. A. Sloane)

Crossrefs

Cf. A228407, A229218, A377925.

Programs

Python

from itertools import islice
from collections import Counter
def A377926_gen(): # generator of terms
    yield from (0,1)
    l, s, b, c, j = Counter('11'), 1, {11}, 11, 1
    while True:
        i = s
        while True:
            if i not in b:
                li, o = Counter(str(i)), 0
                for d in (l+li).values():
                    if d % 2:
                        if o > 0:
                            break
                        o += 1
                else:
                    j += 1
                    if i>c:
                        yield j
                        c = i
                    l = li
                    b.add(i)
                    while s in b:
                        b.remove(s)
                        s += 1
                    break
            i += 1
A377926_list = list(islice(A377926_gen(),40)) # Chai Wah Wu, Dec 14 2024