A380837 Sequence Sg of the eight sequences defining the blocks of terms in A377091.

4, 9, 20, 31, 42, 60, 81, 100, 121, 147, 183, 210, 241, 272, 307, 342, 400, 441, 484, 529, 576, 651, 703, 757, 813, 871, 931, 965, 1023, 1059, 1089, 1125, 1190, 1228, 1296, 1369, 1408, 1448, 1520, 1525, 1598, 1603, 1681, 1764, 1849, 1936, 2070, 2117, 2209, 2302

Offset: 1

Author

Paolo Xausa, Feb 05 2025

Keywords

• nonn

Comments

See the comments in A379788 (Sequence Sa) for further information.

Apart from A379066(1) = 0, the beginning of this sequence coincides with A379066 up to a(27) = A379066(28). a(28) = 965 is the first term not present in A379066 (cf. A380838).

Links

• Paolo Xausa, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A377091, A379066, A379788, A379789, A379790, A379791, A379792, A379793, A379794, A380838.

Programs

Mathematica

SequencePosition[A377091list[5000], {?Negative, ?Positive}][[All, 1]] - 1

Formula

a(n) = A379788(n+1) - 1.