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

1,1

Comments

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

Apart from A379066(0) = 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

Formula

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

Mathematica

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

Crossrefs

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

Sequence in context: A073360 A297190 A075385 * A379066 A048150 A177441

Adjacent sequences: A380834 A380835 A380836 * A380838 A380841 A380842

Keyword

nonn,new

Author

Paolo Xausa, Feb 05 2025

Status

approved