A086987 a(n) = A000203(A086986(n)).

4, 7, 8, 15, 13, 18, 28, 14, 31, 18, 20, 42, 32, 36, 60, 31, 42, 40, 56, 30, 72, 32, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 84, 78, 72, 48, 124, 57, 93, 72, 98, 54, 120, 72, 120, 90, 60, 168, 62, 96, 104, 127, 84, 144, 68, 126, 96, 144, 72, 74, 124, 140, 96, 168, 121, 126, 84

Offset

1,1

Links

Table of n, a(n) for n=1..67.

Example

62 is in the list because sigma(61) = 62 = sigma(13)+sigma(14)+sigma(15) = 14+24+24.

Prog

(PARI) \\ needs isok from A086986
[sigma(n) | n<-[1..85], isok(n)] \\ Andrew Howroyd, Sep 13 2024

Crossrefs

Cf. A086986 gives n, A000203.

Sequence in context: A073435 A376163 A324854 * A051219 A344581 A270216

Adjacent sequences: A086984 A086985 A086986 * A086988 A086989 A086990

Keyword

nonn

Author

Jon Perry, Jul 27 2003

Extensions

Missing a(52)=127 inserted by Andrew Howroyd, Sep 13 2024

Status

approved