A363450 Partial sums of A180405.

2, 3, 7, 13, 16, 23, 31, 41, 52, 67, 79, 97, 111, 127, 149, 173, 192, 223, 251, 271, 294, 331, 367, 397, 423, 457, 486, 521, 563, 601, 641, 673, 712, 757, 809, 853, 907, 953, 1009, 1069, 1112, 1163, 1213, 1277, 1361, 1409, 1458, 1511, 1579, 1637, 1699, 1777, 1847, 1913, 1970

Offset: 1

Author

Neal Gersh Tolunsky, Jun 02 2023

Keywords

• nonn
• easy

Comments

The construction in A180405 means that if n is in A180405, then a(n) is prime. It seems that the converse is also true: if a(n) here is prime, then n is in A180405.

Indices of composite terms are given by A363379.

Links

• Neal Gersh Tolunsky, Table of n, a(n) for n = 1..10000
• Neal Gersh Tolunsky, Graph of first 36568 terms

Crossrefs

Cf. A180405, A363379.